> I believe that a new shell language is coming to replace bash.

There exist zsh and fish, but they don't replace bash for exactly one reason:

Noone is willing to go through all the shell scripts [other people have written] in their system and rewrite them in the new language.

Will shill be any different? Only time will tell.

> Noone is willing to go through all the shell scripts [other people have written] in their system and rewrite them in the new language

Why is that a requirement at all?

Because of the massive amount of legacy bash scripts that are running on almost every server out there, to migrate away from Bash is very expensive. Both in terms of human resources, time and of course risk of failure.

Unless something new come up that provide something significant enough for people to eat that cost and move to do this new version, I don't see Bash going away anytime soon.

It also hasn't changed a lot since it's creation in 1989, for good or worse.

Who said you had to migrate away from existing bash code? You can just start writing new scripts in whatever language you want. Especially if it's a shell language and you're communicating via argv/stdin anyway. The continued existence of bash doesn't mean that you can't use anything else.

Did C go away when Ruby/Python/Perl et al came into being? Or did people keep on writing both?