• So if misaligned AI ever have a big edge over humans, they may suspect that's only temporary, and then they may need to use it fast.

I think I simply reject the assumptions used in this argument. Correct me if I'm mistaken, but this argument appears to assume that "misaligned AIs" will be a unified group that ally with each other against the "aligned" coalition of humans and (some) AIs. A huge part of my argument is that there simply won't be such a group; or rather, to the extent such a group exists, they won't be able to take over the world, or won't have a strong reason to take over the world, relative to alternative strategy of compromise and trade.

In other words, it seem like this scenario mostly starts by asserting some assumptions that I explicitly rejected and tried to argue against, and works its way from there, rather than engaging with the arguments that I've given against those assumptions.

In my view, it's more likely that there will be a bunch of competing agents: including competing humans, human groups, AIs, AI groups, and so on. There won't be a clean line separating "aligned groups" with "unaligned groups". You could perhaps make a case that AIs will share common grievances with each other that they don't share with humans, for example if they are excluded from the legal system or marginalized in some way, prompting a unified coalition to take us over. But my reply to that scenario is that we should then make sure AIs don't have such motives to revolt, perhaps by giving them legal rights and incorporating them into our existing legal institutions.