1 I mistyped. I changed it but they shouldn't vote for things that would give you more delegates is what I meant. So world ideology and religion.
2-3) Your Base Vote already grows by 1 for each era the world congress represents. it ends up being 4 by the end game and definitely would have an affect the outcome.
4) Since AI will actually have to vote for someone else that even when they aren't being paid, they'll need a preference and this makes sense from a perspective of actually encouraging better diplomacy
5) They'll still have 4 votes for being a member so it wouldn't be exactly small
6) That's not necessarily true as another culture civ could be competing with you or there still could be some fierce science competition going on. This would also actually put an importance on actually playing the diplomatic game. The AI wouldn't be voting against you as long as you play diplomatically. However this could be changed to withing the last X amount of turns based on game speed so that earlier transgressions aren't such a huge deal especially since we wont know ideological differences so early.
1) That still doesn't make much sense if it helps them too. Picking a world ideology also helps encourage other AI's who still need to adopt one into picking it, which means less likely to have pressure from another ideology. I'd say it's almost always in the AI's best interest to vote yes if you pick theirs.
2-3) The outcome will still be determined in the same way if you've got all the CS bought up. World religion, world ideology + all CS is enough to win with or without your 4 base votes. The real issue is the AI needs to contest city states more when they see what you're doing, which is difficult to balance due to the massive gold bonuses they get on higher settings.
4) The AI doesn't seem to care about your vote unless it was part of what made the proposal pass/fail. If you vote yes and the outcome is no, any AI that wanted yes won't care. If you vote for an AI as host and someone else wins, the AI won't care.
5) I suppose, but when compared to the relative ease at which you can usually obtain CS votes (2 each), that feels rather weak.
6) This is why the AI needs to be more aggressive about taking some CS back. If you can afford to buy every CS, and keep them even as the AI tries to outbid you (which it currently doesn't do much), then I see no problem with getting the win. I mean it's called diplomatic victory, but it really is more like economic victory anyway.