Personally, I'm expecting the negotiations re: TCN to be one of the final things we do in the Quest before time skip.
As for the TCN... it's a "control" network, so I would expect you could control where it goes and what not, so could pull Tib out from deep in the crust and have specific mining areas for it, with it "disappearing" outside those zones. Between that and Venus, we have time to figure out how to make STUs without needing Tiberium. Eezo might end up involved.
Honestly, it would be hilarious if the only real use of Eezo in our tech turns out to be in the field of STU production. FTL? Nah, we portal ourselves around. Make the ship lighter? Nah, we portal ourselves around. Biotics? I'm sorry, we have very strict handling and transfer protocols to prevent exposure to it, especially around pregnant women. Shield systems? Pah, we cracked that before we really got studying any amount of Eezo. More powerful reactor systems? Have you seen how much we've miniaturized our fusion systems? We have fusion batteries in our knives. Our civilians have microfusion batteries in their phones. Mass Relays? Did you miss the part where we portal ourselves around?
As for the TCN... it's a "control" network, so I would expect you could control where it goes and what not, so could pull Tib out from deep in the crust and have specific mining areas for it, with it "disappearing" outside those zones. Between that and Venus, we have time to figure out how to make STUs without needing Tiberium. Eezo might end up involved.
Honestly, it would be hilarious if the only real use of Eezo in our tech turns out to be in the field of STU production. FTL? Nah, we portal ourselves around. Make the ship lighter? Nah, we portal ourselves around. Biotics? I'm sorry, we have very strict handling and transfer protocols to prevent exposure to it, especially around pregnant women. Shield systems? Pah, we cracked that before we really got studying any amount of Eezo. More powerful reactor systems? Have you seen how much we've miniaturized our fusion systems? We have fusion batteries in our knives. Our civilians have microfusion batteries in their phones. Mass Relays? Did you miss the part where we portal ourselves around?