It depends how long you expect people to play the game. If people are happy with just discoevering a new game and then leaving for something else after less than 50 hours of play, then you don't need any AI. If they want people to buy expansions, however, they may want to cater to people who like the game, so those who play a lot of it, not to make bad press so they'll be able to sell expansions. If they want to sell DLCs, they need to have people play the game for a long time. Currently, once you're beyond the exploration/discovery phase, the game offers no challenge, so it's unlikely to keep people interested and have them buy DLCs. And anyway, you don't need a "vastly" improved AI to make the game vastly better. You need an AI that can win, and that only requires a few changes. In my current game, Arabia swarmed a city defended intially just by a lone hoplite corps. They brought 8 mamluks and never attacked the city. Hadthey attacked, they'd have lost maybe 2 mamluks and taken the city. By jsut moving around and pillagin, I killed mamluk after mamluk withmy field cannons and city defense. The only thing they needed to do was "attack city". It should not be a lot of work. In the same game, Russia has 2 great writers and 2 great musicians dancing around St PEtersburg but they haven't built a single culture district, so they can't use them. It is a small improvement to actually use one's great people, but it would vastly improve the experience. I could steal ther great works, ot they could threaten to win a culture victory for instance. When I am offered a deal, I can sometimes take everything form the AI, sometimes if I refuse to take part of the deal as in, no I don't need that horse, they refuse. As a result, I can't bargain. Fix these three things and, even with poor tactics and upgrading but given production and combat bonuses, the AI may be challenging enough for the game to warrant playing more and buying DLCs/expansions. Personnally, if they don't fix the AI in some patch quickly, I'll shelf the game the same way Ishelved Civ 5 and will not buy any expansion or DLC but return to Civ IV or EU IV or whatever else I can find..