> I just don't see Mozilla having enough resources to keep-up the momentum long-term.
Did you forget about Samsung? Mozilla and Samsung aren't the only two companies backing Rust.
http://www.tiobe.com/tiobe-index/
Call it money or whatever, but Go seems to be getting substantial TLC from the people working on it for every point release.
Of course, this could just be an easier thing for them to do since their approach is not as ambitious as Rust's.
Google is not a language company and doesn't hire good language people so I don't see this changing.
Disclaimer: I work for Google
If I have to write native code, right now it'll be C++ precisely because it's able to express complex problems with a high degree of getting-it-right (because while I would never claim to understand C++, I feel confident in my understanding of the subset of C++ that I use). I really like Rust and look forward to it being a better fit for what I want to do, and every time I look at it it's getting closer.