As long those languages aren't native, they won't be nearly as popular as swift. Swift doesn't need to be adopted outside of iOS development at all, because when people develop iOS apps the main choice will be Swift.

Swift is actually a very pleasant language, and apple provides some pretty good documentation although it could be better.

It's going to play out like this: Swift or Objective-C (for legacy codebases/people who already experts in objective-c and don't want to switch), and some other, slower languages that will always be second class.