I don't disagree, but at least anecdotally a lot of the shops I've been involved with/worked with are really excited about Rust and Go. A previous employer that used C++ exclusively has even shipped a few Golang based tools, and is planning to introduce it into the main product soon. No new projects are being started in C++ either.
Definitely recommend learning C, but having Rust (or Golang) exposure will likely be helpful in the near future.
Great post btw.
Know your requirements and then you can decide on the runtime.