One of the other things that makes me worry about Rust is how similar it's depends look to npm projects, where there's a kitchen sink of third party (not the language's included library of code, and not the project's code) libraries pulled in for seemingly small utilities.
1. End up with a third party package filling in the gaps, or
2. Another standard library API that users slowly migrate to
We'll see how this works, Rust is still young and not yet used in any hugely important projects (or at least not in hugely important parts of those projects - e.g. some Linux drivers, not the core kernel; some bits of Firefox'S rendering, not the JS engine). As it becomes more central, it's value as an attack target will increase, and people will start taking infiltrating malicious code in small but widely used dependencies.
Having a large and good standard library, supplied by a single trustworthy foundation, with dedicated employees that check incoming PRs, is going to become more and more important in the following years.