See, you're saying all this... And you're 100% correct. I agree. A 'systems alliance' using the GDI tech base and having a wholly different culture and approach would cause all kinds of butterflies to mass effects setting and plot.
That's the point.
Changing something to see how it butterflies things from there and snowballs into more changes. Which is all kinds of useful because it allows a different story to canon mass effect and means we won't always 'know' the answer by using out of character knowledge.
And I think there will be a lot less to do than we currently have, next to none of the same sense of urgency, and a lot less incentives to go out and engage with the setting. Which people still haven't addressed. As annoying as it is to have to argue with so many people on an issue like this- my point stands, while I doubt GDI will be outright isolationist, they have a lot of reasons to stay home. Tiberium is currently forcing us to act, Nod is forcing us to act, the potential of a Scrin invasion is forcing us to act, our political factions are forcing us to act, most of those aren't applicable or are going to be applicable in entirely different ways. I won't be so arrogant to say a plan quest relies on urgency, but I think it's a pretty important ingredient- and it definitely won't be there in nearly the same degree without the Reapers, and I genuinely think Reapers and Scrin have a hard time coexisting unless you insist the Scrin come from outside the galaxy or something, and that completely changes what the Reapers operating in Dark Space beyond the rim implies.
C&C and ME are completely different, and a fusion doesn't always work well- especially when the story/quest wasn't built to be a crossover from the ground up. C&C is so much rarer and so much higher on my lists to see well done than what is literally the most overused sci-fi setting in fiction right now I'd much rather focus on what makes C&C interesting than inject all of ME here. Do I think Ithilid can probably make it work? Yeah. Do I think it will be nearly as satisfying as trying to arm GDI for war against Nod or the Scrin as we wage a desperate battle for the fate of our world against an increasingly alien environment? No.
The Brotherhood of Nod is more than happy to share the promise of tiberium with the galaxy! Even more so if the aliens happen to be assholes. GDI will never halt our efforts to harness the green crystal! As an aside I think Tunchaktka would greatly benefit from some tiberium introduced into the ecosystem.
I kind of wonder how the ME races would react to the stuff though. Either curiosity or horror would be my best guess.
I mean, that sortof relies on an idiot ball when GDI has very little heavy industry outside of it's control and how hard to hide a space ship normally is. I doubt NOD could hide a relay jump or accelerating into FTL.
A first contact war is something that could be more likely than before simply because GDI is going to build defenses and be rather trigger happy when it comes to unfriendly aliens.
I mean, they're also going to probably open far less relays far less rapidly because they're going to be prepared to put down whatever comes out. It's hard to overstate how hard the SA was pushing the expand button.
More that there will be a larger part of the population willing to go to some new colony. The government would also be much more inclined to support and fund colonies simply because they want people off earth.
That means they'll want to go to the nice planned cities, not roughing it in the middle of nowhere with ~10,000 people on the entire planet. Which is what SA did.
This is insulting, and I'm going to ask you to apologize.
Sorry, I had to do that leg of the arguments on a phone so I was getting testy by the the end of it- but even then. Like you said yourself- Eden Prime will be receiving hundreds of millions of colonists. As for Garden worlds? The two systems listed in the Exodus cluster have two pristine garden worlds in Eden Prime and Terra Nova. Those two alone would provide massive amounts of living space inside a single relay cluster, especially if we assume the Exodus cluster is more than those two star systems. That was literally with 5 minutes of looking and
I object to your tone. It's offensive.
With that being said, yeah sure, GDI may be more cautious, building up individual colony worlds like it now builds up the Blue Zones. It will still want several colony worlds, worlds that are reliably habitable without extensive terraforming. And it will want to build forward defenses and habitation in whatever relay systems "lead to" its own colony world/clusters.
Also...
There's Nod.
Nod is very likely to make it into space, one way or the other. Our evacuation screenings won't be perfect, especially if we start bringing Yellow Zoners along, and we should. Barring Kane's active intervention, many of the normal warlords will stop fighting us if tiberium has clearly overrun the planet and we're the only way out. And Nod's inner circle are clearly capable of building spaceships if they're so inclined; you don't get the capacity to make things like Avatars and Banshees without the capacity to construct space-capable assets in principle.
...
The thing is... the Mass Effect Council races don't really have a concept of a politically divided species. They're going to see GDI as "the human government" and any trouble Nod creates, they are likely to complain to us about. This will create considerable pressure on the galactic stage for us to take responsibility for suppressing any problems they have with Nod.
And yes, it's going to want military installations and some depth to protect the important worlds, but no corporate colonies, almost certainly no independent colonies barring NOD, and much less economic incentives to claim clay. It's the same with the Green Zones, where we're investing heavily in and fortifying the 6% that live in the periphery- though I will point out that GDI to some extent is trying to draw that population into the Blue Zones. And while I don't disagree that NOD isn't going away, the nature of it being a threat to human survival likely will with humanity going into the stars. NOD's going to undoubtedly cause us diplomatic problems, and fighting to keep tiberium in Pandora's box is likely going to be constant. Likewise, when it comes to defensibility- the lack of a permeable border (barring slower FTL) means the defenses are always going to centered around primary and secondary relays.