As a semi Rust hater, but Firefox user, I believe Mozilla should go absolutely all-in on Rust, for a mixture of direct and indirect effects. That and/or launch an open source e-Reader development project.
No MBA type is going to be able to do anything of the sort.
Setting aside questions like "is Rust a religion or actually useful"...
Rewrites tend to kill software projects. Even if you don't completely change the language to boot.