I agree with the analysis of the east coast, and will add that the South ("Silicon Bayou" is such a sad joke) is in basically the same place.
But I don't think the West coast actually has all those advantages either, not anymore. What passes for "innovation" is all some variation on crypto, ai, or "being the Uber of $NICHE." Throw in some buzzwords like IoT, quantum, blockchain, or "smart" and you're all set to race with the other founders to get a piece of that sweet sweet VC dollar.
The financiers have taken over everything and are going to drive the economy off a cliff so they can scavenge and sell the parts. They've taken over film, gaming, tech, all traditional media, journalism, and they're using the banner of "privatization" to finish off healthcare, education, postal services, and anything else they can convince idiots to sell them. The bankers are winning.
Rich people always threaten this and never do it, because it's a John Galt problem. Rich people need poor people to trickle money to for services and goods. If they all move to "Rich Asshole Island" where there's no laws or taxes, they quickly discover there's also no workers.
Fuck all of them, I dare every millionaire to leave NYC. They almost certainly cannot. All their wealth is actually tied up in business and assets. In NYC. They could sell them, but to whom? All the rich are fleeing right? If the city or collectives of workers buy them, thats more socialism and proof the rich aren't necessary.
So no, they won't leave. They'll whine and cry and then fund police and paramilitaries and lobbiest to try and force their view. They'll spend millions propping up friendly candidates like Coumo and running smear campaigns.
In other words, they'll do what they've historically always done when threatened.