This is a small shift in the grand scheme.
It might help create new centers. But the gravity is going to be around the universities and infrastructure that is unique to the area.
Shifts like that rarely happen overnight.
Especially not because of something as temporary as a pandemic.
Not sure if there is any reason for sf once most startups moved sonewhere else.
My LinkedIn account is always flooded by recruiters. That gives engineers leverage to seek new and better opportunities all the time.
Plus networking is also a big one.
Unless you get a job at Google/Oracle and planning on retiring there, SV wins hands down.
The language barrier is also a no go along with cost of living.
Good luck fitting in for you when you get there!
The not fitting in is a way bigger deal in Switzerland. Germans will never be accepted, no matter what. Eastern Europeans aren't even considered people.
Infrastructure might be the wrong word.
I was mainly thinking of soft factors that take time to grow following the exodus. As well as geography and demographics.
One could argue that diseases were major contributors to the collapse of the Roman Empire - internal problems didn't allow them to keep the external forces at bay.