I think looking only at technologies is the wrong approach.

The underlying concepts stay the same. Your own experience is much improved.

Some old technology gets replaced? I celebrate the demise of Flash.

I am not Flash or even a Flash developer. I am a software developer.

I am a bit sad Dlang is not more used? Yes, I am. But I am not a "Dlang" developer.

Tying yourself to some technology seems self limiting.