None of them have faded.

Cobol? Seriously, there are probably more Cobol programmers than there are Python programmers.

And C? Most of the world runs on C, and its irreplaceable language in a non desktop computer.

And you will be surprised how much Perl code is written everyday.

The root comment is talking about the fad of the year, the kind of a language web devs use as flavor of the year. The current ones are Javascript frameworks. In this case the 'fade' is just the web framework, that probably has less mind share and open source dev contributions.