I think you're right, but I don't think the end game is that everyone gets FAANG-level salaries everywhere.
When companies realize that they can hire people for a fraction of SF Bay Area salaries while still paying them 20-30% more than their local salaries, the overall compensation structure will slide downward toward that number.
Then the next step is when they realize they can hire foreign people in similar timezones at another lower step on the compensation ladder (while still paying more than their local jobs would offer). The compensation then slides further down toward this average.
> In reality, if you're top tier talent, you can command top tier compensation no matter what your ZIP code is.
Works in theory, not as much in practice. There's still value to having people collaborate in person (I say this as someone who has primarily worked remote long before COVID). Companies paying top dollar have a lot of leverage to get employees to move and work in-person still.