The whole idea of pendulum swings, left or right is a long-term phenomenon.
Cities that keep electing charlatans and fools are destined to watch their cities collapse or become destitute, (I was raised in Detroit!).
Sometimes things have to hit rock bottom before efforts are made to resuscitate the city. It basically depends on the level of idiocy of that voting population. If they have the collective IQ of a gnat, then they will suffer all their lives.
If they wake up and begin trying to change the downward spiral then there is hope.
Colleges and universities have become nothing but indoctrination centers to transform American youth into the kind of idiocy you mention—woke, trans-queer, baby-killing, America-hating, unintelligent, unemployable, non-functioning meat sacks with a vote and the motivation to march, riot, and follow orders from those with a radical left agenda.
Marxist, Islamist money and the above-described voting bloc are what elected Mamdani (and Sliwa helped by splitting the opposing vote).