Its cross-platform support (not just for using but also for building it) is not there yet, and it is quite huge and unstandardized with only one full implementation. I'd agree the last part will change with age, but given the frequent large changes and feature additions I am afraid it will be harder and harder and it is simply too complex and fast-moving for many low-level applications. It is closer to C++ than C in my eyes. I'd be happy seeing it replace C++ though for its memory safety benefits!
That's true, but they're working on an ABI implementation. It's no mean feat with a language like Rust. A quick search around the Internet found various possible candidates, though many of the discussion threads have petered out.
I wouldn't say "need", but there are possible improvements to ergonomics and safety that wouldn't make the language itself more complex or high level. I think it does its job quite well though and will be here for decades to come.
Ada has been around since 1983 and is objectively superior. Yes I will die on that hill.
It's too bad programmers are all such egotards they think they can write bugfree programs in C, while whining about how "restrictive" a safe language like Ada is.