Network effects are powerful. But beyond the original secondary tech centres of Seattle, Boston, and NYC, there are now thriving tech scenes in all sorts of smaller markets--Portland, Denver, Austin, etc.

It's easy to see every major tech company having a base in SFBA for the foreseeable future, but it's also easy to see being a working programmer living in one of those smaller markets and actually being a homeowner being a much bigger thing going forward.

Given how hostile most of those companies have been to remote work, I'm not too optimistic. I hope to be wrong, though.

And while those other cities do have some tech scene, it's still nowhere near that of SV, and that's still the first choice of most developers.