But how many of those problems stemmed from the external requirement that those fleeing would have to commute back in 5 days per week, and for the most part all on the same 9-5 schedule? There's a version of moving away from dense urban cores that still accommodates community, transportation, public space, local necessities, commerce and small businesses, etc.
Many of those issues had nothing to do with how crappy commuting is for affluent people (a significant problem) but what happens to the people without the means to escape.
Local tax base diminishes, concentration of low incomes leads to a sort of ghettoization, etc.
Personally I think density and varied income levels within that are good for a number of reasons.
I really hope we don't see a late 20th century style flee of cities either. The problems with that from last time are well documented.