Coding an AI to act like a human is pretty near impossible (what strategies do you give it?) It would be sweet if the AI learned from every game that the WarLight community played with it. I just don't think Fizzer has the time to create a challenging AI structure.
There is this UserVoice item:
http://warlight.uservoice.com/forums/77051-warlight-features/suggestions/1271493-cleverer-ai?ref=title
but i just don't see it happening very soon.