There is always hype; the reason the "hype cycle" is an identifiable thing is that it repeats over and over again. And once the hype and the disillusionment die down, that's when you end up with a useful language.

(I say, as I work in Scala. But I think it's slightly different from your other examples; it's been around much longer than the other three languages you mention.)

Who cares? Languages get hyped because people are newly finding them as great solutions to a problem they have.

There's no "perl hype" because (virtually) nobody is just discovering it as something new and useful.

As python came to have a robust web ecosystem, it started to get a lot of hype as it was getting a ton of converts from perl/php/etc.

Now as web tasks are changing, Go's niche is becoming larger, and people are excited to use it where Python was failing them.

This will continue forever, most likely.

I am not the one judging the hype, FYI.