To be honest, I don't think this is something you'll get in TS4. This really sounds like something that would happen in a spin off. Muuuch like TSM. This could be a futuristic game, living on a Alien world, and maybe conquering other planets? Not sure how it would go, but it sounds a lot more plausible in a spin off game than embedded into the TS4.
I'm pretty sure TS4 has already been planned out mostly for this generation. (Since there is more and more rumors of working on TS5.) That usually means, TS4 is already "done" in the sense that all the expansions and game pack concepts have been approved and are in the process of being made. I can't help but blame the lag and bugs of Island Living on their rush to end it. Even though, we were promised that TS4 would be a longer generation than the others.