I'm not opposed to having 1.5 million ton cruisers. But if we want those any time soon, then for political reasons we should be committing to that BEING our next cruiser. We're not going to get away with having multiple semi-redundant cruiser designs within a 5-10 year period of each other.
That could be tricky since we need 3 years research at least in various fields, and the prototype takes 6 years of build time. We could be really pushing it to get it in commission in ten years if we don't have our ducks in a row first
Yes. It would be doable (remember we'd be staking out this goal in 2311, so we have time to do explorer research before we even undertake the goal). But it'd be tough.
Also, remember that we want the
Ambassadors to be not just better than the
Excelsiors, but a LOT better. Enough so that there won't be arguments about whether it was worth it. That requires us to either make them a lot bigger (in which case they won't fit in even our three million ton berths) or push our technology a bit further.
Maybe we could push to modernize the
Excelsiors based on what we know now? We've had a lot of success with our explorers, even in fleet battle, and they're definitely the pride of the service. If we say "we're planning to upgrade the
Excelsiors," we could improve their science and defense and so on along with everything else.
Perhaps we could make a goal revolving around
modernization of the fleet, rather than building lots of new ships. That will play better with the Council than just trying to have swarms of new ships while forgetting about our old ones.
Or a goal that revolves around defenses and integrating starbases and listening posts so that our space and our affiliates are secure from intrusion.