If Mojo can nail single-file deployment and have a Cargo-like packaging experience, along with the characteristics you highlighted, it could be an excellent general purpose language for web backends, cli tools etc
I think it will get there with packaging. (Modular was recently hiring someone to work on Mojo's dev tooling full time, which sounds awesome, and I don't see that role any more so perhaps it was filled.)
Mojo is already the language I want to reach for for 100 things outside of AI. It would just help to know that the team behind it will actively support/encourage use of it in those spaces first.
In my experience, a diverse community of people who want similar but /different/ things is what builds out a thriving community. This is why LLVM is pretty great for example: lots of people have a shared view on what technical excellence means, but they all want different things so you get a well balanced ecosystem, not just "Apple's compiler".
-Chris