There's good news and bad news here... haven't heard of Rust before and searched to see its market share and came across with this chart: https://www.dropbox.com/s/3kaqarmu2otd6rg/Screenshot%202016-07-12%2017.30.10.png?dl=0
Good news is: PowerShell has the lowest market share, thanks God and hope it will stay so.
Bad news is: 0.245% market share...
Don't want to start any flame war between languages, but isn't it too obscure?
There was a good thread on Quora where a 69 year old programmer answered what programming languages to learn. He mentioned that he had seen languages/frameworks come and go and focused on the core ones and laughed at people who worry about learning every language.
You only need to know 1 language. C. After that all the others fall into place. Of course, we C# people like to argue with the Java people but nobody is funnier to troll than a COBOL programmer. Just say something like "You're as useful as a COBOL programmer" and watch the hate fly.
Rust is pretty obscure in terms of people actually using it, in jobs, yes. But it has some pretty big traction as a second/third/whatever language for programmers, and it's backed by Mozilla, a big enough name I think for people to pay attention to it. They're starting to ship some Rust code (albeit a very small amount) into Firefox, so while maybe it's not the most used language in the world yet, I don't see any reason not to add it.
(disclaimer: not a rust programmer, tried to learn it a bit ago but was too lazy to do anything useful with it)