Fresh grads, interns, and apprentices typically uproot their lives to move to tech hubs, as do older populations.
That is the terrible effect - getting dropped in a strange new location with minimal network. Of course letting "locals" work remotely would make that situation worse, agreed.
So completely do away with tech hubs. People can continue to grow organically, they are free to stay or move as makes sense to them individually.
As a society, we should be striving to continue decoupling work from our identity.