> I think we ought to be keeping people trained and employed

I never understood this sentiment. We don't have a massive manual weaving industry anymore, 95%+ of people used to be farmers in 1900. Tech comes and replaces humans, and the transition can be extremely painful especially for the people replaced, but ultimately it's better than keeping people artificially employed in obsolete jobs.

(I don't think SWE will be obsolete, but even in this case I'd rather switch careers)

Most deindustrialized regions in the West haven't recovered to full prosperity and are quite depressing to live in, sometimes even 30-40 years later: US Rust Belt, Wallonia in Belgium, the French North East, etc.

At a large enough scale, most people don't really move on, their lives are wrecked and they just suffer through them.