No king rules forever. C has become a much more niche language than it was 20-30 years ago, and the trend continues. C++ has slowly eroded most of its niches, and there's a slew of new languages gunning for its throne - Rust being the most likely to succeed (especially once we will have some popular Linux modules in Rust).
Will there still be a niche for C programmers 50 years from now? Absolutely. Just like there is a niche for COBOL maintainers today.
In a similar grain, git is a beautifully designed and conceived simple content-addressable object store. With a complex and challenging UI (I don't have any problem with it, but still).
Neither of these tools are perfect; in fact they can sometimes be objectively be more imperfect than many of their competitors. But they are special.
> some have written the same about various assembly languages, about COBOL, about FORTRAN, about LISP in AI
It's not what people write about - it's what they use. C, UNIX(/Linux), Git are all very similar - and Pervasive.
same answer.