I agree that losing old Twitter is certainly net negative, but MuskX was what killed it, not the flight to Bluesky.
But also, the extent to which Twitter and institutions were caught completely off guard by Mamdani's massive win suggests to me that Blueksy is not the fishbowl.
It's hard to avoid the conclusion that Bluesky has been a net negative for US politics. They corralled everyone on the left into a little glass fishbowl where they shout at one another & everyone else ignores them. Meanwhile, all the pols & institutions stayed on X & are being dragged farther right.