Rust is in a pretty good place; it is getting more and more popular, has more and more contributors, and is used in some pretty significant places. However, it is a time of flux and change, and transitioning from a research project then a new, rapidly changing language to a popular, established project is a difficult change.
Here, I want to describe what I think are the ten biggest challenges for Rust for now and the next few years. I have some ideas for solutions, but they are all big, difficult questions with no simple answer, so the real solutions will all take iteration, energy, and creativity. My focus is on the core project; there are many challenges for the community and ecosystem (e.g., how to make GUIs with Rust, or how to get more crates to 1.0) which I think must be primarily solved by the community.
Source: Ten challenges for Rust, an article by Nick Cameron.