I knew a bunch of them. Most of them moved on: retired or started over in new careers. It hit them hard. Maybe not so hard because trading was a lucrative career, but most of us don't have that kind of dough to fall back on.
+1 this. Saw it first hand, it was ugly. Post-9/11 stress and ‘08 cleared out a lot of others. Interestingly, I’ve seen some of them surface in crypto.