In tech, I think it will be a lot sooner than in few decades. I think things will change at such a rapid pace that we can't even accurately predict what will be the new normal in a few decades, particularly in tech. Also, we must also consider the possibility, and implications, of strong AI in a few decades.

I'm embarrassed to say that it took me 8 years to realize that staying at any one particular employer for "a long time", e.g. 4+ years, is increasingly an unrealistic life goal.