I suspect that will work as well as outsourcing to India did; in two years they’ll be hiring everyone back again.
I’ll hire devs who can solve problems, no matter the stack
Should have been doing that already. A decent programmer can pick up a new language in six months; it’s the ability to follow logic and solve problems that’s important, not the language they use. (Unless you’re switching to a completely different paradigm: Haskell to Python, for example).