AI takeover is bad if whatever the AI does afterwards is worse than what would have happened if the AI had not taken over. Starting with whatever the AI does being worse than humans would have done.
If you have an AI that demonstrably does better than humans on whatever your metric is, then AI taking over from humans is obviously good. I mean, sure, nobody has any idea how to make that happen, and there is definitely no reason to expect it to happen by default. Nonetheless, “Who has the power?” is a very human way to miss the actually important question of “What are the results?”
Reminds me of Manna