You could feel that Rust as a programming language is the greatest thing to ever happen to computer science, the big question for a corporation’s C-suite is can it make money. I’d assume (perfect possible that I’m wrong) that Rust does nothing but cost money for Mozilla. This is not to say I think it will be cancelled or force to expatriate and become a separate legal entity, but management is beholden to shareholders, not the tech community at large.
And yes I know that Rust does receive some corporate funding from other entities, but it is still a Mozilla product.