Last couple of companies I worked at, they are already outsourcing "average" work. We had a QA manager in the bay area, and then he had a team of six people in SE asia doing QA/QA automation. On the engineering side we had a team of 20 engineers in eastern Europe working for less than 30k/year usd working on bug fixes and test coverage, UI fixes, modifying legacy code from the original monolith that didn't change a whole lot etc
In the bay area we only had five engineers, mostly focuses on architecture, R&D, new products etc, and even then they only came in two-three days a week mostly for face to face meetings. The VP had a lake house in tahoe and would work remote for 2 months every summer.
I can see a bunch of legacy code maintenance/qa work moving offshore further, but there will always be a core group of five to ten engineers who meet at the central office a couple times a month. Remote will increase but humans still need face to face contact periodically.