This whole rant is so cringe it reads almost like satire. From the sound of things, the people leaving for other expensive areas were just wealthy semi-tourists who weren't contributing anything meaningfully positive to the city to begin with. The sorts of people the author expects SF-ers to look up to as parental figures or something. Good riddance.

The only thing that is likely to cause SF to experience a Detroit-level exodus is climate crisis. Where will the people migrate to? Probably Detroit!