Earlier quoted context omitted.
It already has! Ethnic food has thoroughly suburbanized, as has shopping.
I suspect I can get a larger variety of ethnic food of very decent quality in 1 hour in NYC than in 99% of suburbs. Shopping for large items, or large quantities, definitely tends to use suburban land because it's cheaper, and a shopping center uses a lot of it. The cost for the customers is the time to drive there.
I live in Baltimore, and if you ask after Chinese, Korean, Indian, or Vietnamese, without specifying city limits, you will be directed to a place in the suburbs with a parking lot (I think this is essentially true of DC as well).