From a purely utilitarian standpoint, I’m inclined to think that the cost of delaying is dwarfed by the number of future lives saved by getting a better outcome, assuming that delaying does increase the chance of a better future.
That said, after we know there’s “no chance” of extinction risk, I don’t think delaying would likely yield better future outcomes. On the contrary, I suspect getting the coordination necessary to delay means it’s likely that we’re giving up freedoms in a way that may reduce the value of the median future and increase the chance of stuff like totalitarian lock-in, which decreases the value of the average future overall.
I think you’re correct that there’s also to balance the “other existential risks exist” consideration in the calculation, although I don’t expect it to be clear-cut.
Should a “ask dumb questions about AGI safety” thread be recurring? Surely people will continue to come up with more questions in the years to come, and the same dynamics outlined in the OP will repeat. Perhaps this post could continue to be the go-to page, but it would become enormous (but if there were recurring posts they’d lose the FAQ function somewhat. Perhaps recurring posts and a FAQ post?).