I think CA will continue to work on the core RTW engine for some time, both for expansions and the next full Total War game, as they have already invested so much time in it in going to full 3D, and it has a lot of scope left.
In theory it should be possible for modders to retro fit the improved engine into the existing RTW game, so we could continue to play essentially the same game (units, buildings, map etc) but with a better engine (improved AI, diplomacy etc).
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