I'll keep the baseball, but football stadiums, at least if there isn't non-significant additional non-football programming, can probably
happily survive in the burbs. In the urban hellhole the stadium complex works in large part because it is essentially the suburban model of a giant parking lot at the intersection of a couple of major highways, plus a subway stop. Though one can envision a possible future where "giant parking lot empty most of the year" ceases to be the best economic use of that land...
