I'd be really interested to see the argument in which the city is better off in the opposite case - the startups all, as OP suggested, keep to the suburbs (like

I'd be really interested to see the argument in which the city is better off in the opposite case - the startups all, as OP suggested, keep to the suburbs (like Pleasanton) or cheaper Midwestern cities (won't the gentrification just move to those cities?) or maybe the middle of nowhere where no one will be gentrified but everyone has to spew loads of CO2 into the atmosphere to get there.