Culture doesn't mean being fashionable or trendy. I think you have a mistaken view of what culture means.
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).