Oh, you mean like Linux does with Device Drivers...
So whereas biometrics might replace a traditional "password" - we need more systems which aren't vulnerable to the type of 1.8-billion-password-stealing-Russian-problems we see all over the place. I have been a big fan of much of the two-factor stuff, and some of the hashing schemes out there. It will be interesting to see what kind of other solutions could exist - though I don't think anything "static" like biometrics gets us anywhere.
I'd include links - but there are a lot of them depending on what you want (Linux, PAM, Apache, Andoird, iOS, etc) - So, "Just Google it!"
I am very productive with Perl, and I like it. However, with the surge in things using Python, I find myself "needing" to know it. So where I may have a script to write, and I'm more comfortable doing it in Perl, I actually write it in Python just to learn/exercise the (needed) skills. So - even where I'm "productive, comfortable, knowledgeable and not missing features" with Perl, that's why I'd still do it in Python.
That's why at least for me - it's demise is a self-fulfilling prophecy.