Practically speaking it's not so different than how it is currently though (except maybe lower CoL areas in the same country), it's very difficult to have FTE's in foreign countries, I am in a position to feel this very much right now- either you have to do very complex accounting, become a multi-national or they have to be hired as contractors.
There's still many barriers to it being off-shored, and the kinds of companies that would do that aggressively are looking to replace you anyway.