I agree with your premise, but I don't think what the OP is asking is really that unreasonable. If you learned C++ or Java a decade ago, chances are you still h

I agree with your premise, but I don't think what the OP is asking is really that unreasonable. If you learned C++ or Java a decade ago, chances are you still have no problems finding work. The problem is, you can't know with certainty what tech will be widely used in 10 years; you can only guess, and hope you made the correct decision. If I were to make a bet now, I'd bet on Node still being widely used in 10 years, and to a lesser extent Rails and Django as well.