I think this comes down to how badly designed cities are now since we've been nearly 50 or so years into the single use zoning regulation scheme. What we've gotten in return for this experiment is lower tax revenue, higher infrastructure costs, and ungodly amounts of commute time. If anything, this is a great time for cities of all sizes to down size their physical footprint and get more multi-use zoning in play. It'll take decades but we might actually start looking like Amsterdam or Barcelona in a half a century or more.