Again, not everyone believes 15 years chain restaurants, homogeneous lifestyle, and isolated affluence is worth it.
People with kids and responsibilities have different concerns from those who don't. Whether what I ate or what entertainment I consume are fashionable enough doesn't even hit the radar -- I'm happy if I can eat anything in peace or get any downtime whatsoever for entertainment. You'll be there one day.
The set of people living in the burbs with families are generally living for their kids first and themselves a distant second. Consuming more interesting culture is great and all but it's still just consumption. Even if you're producing art or music, that's something for people with a lot of time for it unless they're doing it professionally. (and lots of great music has been created by bored suburban kids, FWIW).