Not convinced. Offshore has been possible since forever. Maybe IC cam be remote now. Your team can be global. US lead, 2 India based devs, 2 brazil devs. But not having this wasn't a blocker for saving money.

10, 100 or 500 people team in India who could work in the office together was possible forever.

It will change. I think once other countries become bigger investment centres. Not sure how yet though. US is a good potting soil for a startup because there is this huge addressable and free market. And the startup ecosystem. Then add in that most startups want WFO and minimum synced time zones... and for larger tech all that specialism is in house in the US.