I liked Civ 5 as well; but I agree, the AI felt out of whack. I think it was less about "dumbing" down, and more about the fact that because of 1UPT; the old way of increasing difficulty (Production advantages) had hardly no impact late game, because the AI couldn't make stacks of doom. Having to rely more on actual map strategy really highlighted how weak the Civ AI is. And the "combat" AI has always been weak--Civs have always derived most of their difficulty from empire management, not combat strategy. But really, combat AI is a problem in all grand strategy games though. Even ones with "good" AI, like CK2 and all, have major faults. Computer opponents have just been left in the dust by humans as games have grown more complex.
Honestly, the most exciting thing in games, for me, won't be something like the VR head sets--but rather a big leap in AI technology. I think I read somewhere that MS is working on algorithms that can sort and study saved games on the "cloud" in order to better adopt human strategies from similar move sets. Shit like that will be a MASSIVE leap forward in strategy games; if your computer can look at the situation, go and access a few hundred saves from people in similar situations and use their reactions to make better moves. Which is essentially how, as far as I know, a chess simulator can be so good (By simply memorizing all possible moves)--obviously this would be on a far more complex/larger scale. (I'm not holding my breath, though but If it could be done, it would be awesome.)
Going to love the day the computer is even "almost" as good as a human, so the games can be surprising and deeply complex; but I can still pause and save the game because I'm not wasting an actual person's time.