The Culture is a world of AIs that are far better than humans at every task, and keep humans as basically pets out of sentimentality. I agree a lot of "nice" futures with AI will look like that, but the problem is that there are much more "nasty" futures than "nice". I don't see a path from AIs built for profit and national defense to a Culture-like future or any "nice" future at all. Or rather, there could be such a path but it would require AIs to be built for public interest already now.