I think there is a very clear open spot where Jai fits in otherwise why would google be doing the same thing with their carbon language. People want a better c++. It should compile fast, have all the low level stuff of C. Have Metaprogramming and introspection and including a decent library for basic stuff would be nice too.
What this really reads to me is why not just use Rust. Rust is useful for the things Rust was designed for. Some people love it and think its the greatest language out there and that's fine but a lot of people have used it and they either do not like it or they like it but they wouldn't want to use it for the type of work they like to do.
Having more languages and each influencing another is the only way we can get better and better languages.