TensorFlow also has a Swift API in development [3]. The people at FastAI seem quite excited about it [4].
[1] https://developer.ibm.com/swift/
[2] https://github.com/IBM-Swift/Kitura
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.
That would mean its fate would be tied to iOS, which is used only on phones built by a single company. When that company stopped producing mobile phones, or decided to use a different operating system, the language would die.
I would be inclined to say no, it's rather unlikely, short of apple somehow suddenly going bankrupt.
I won't put survival rating for it to be very big. I'm sure Apple would keep it for decades to come, but I'm wouldn't bet on it being anywhere near as popular as it is now in the future.