Really good references to "crossing the chasm" between early adopter needs and mainstream needs. In addition to the Ubuntu coreutils use case, I wonder what other chasms Rust is attempting to cross. I know Rust for Linux (though I think that's still relegated to drivers?) and automotive (not sure where that is).
There are big pushes in pretty much every direction. The projects that really stand out to me are pyo3 (Replace c++ python modules with rust), Dioxus (react-like web framework), The ferrocine qualified compiler (automotive)
I think right now the ecosystem is pretty ripe and with DARPA TRACTOR there are only more and more reasons every day to put rust on your toolbelt.
I am secretly hoping that eventually we break free from the cycle of "hire a senior dev and he likes rust so the company switches" over to hey let's hire some good mid-level and junior rust developers
If you want to take a look at some of the "big drivers", the Project Goals[1] is the right place. These are goals proposed by the community and the language developers put together, they are not explicit milestones or must-haves, but they do serve as a guideline to what the project tries to put its time and effort on.
[1]: https://rust-lang.github.io/rust-project-goals/