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Swift has garnered little traction outside iOS development, while other languages are gaining traction inside iOS development (javascript mostly, but Kotlin is also trying to make headway into iOS development). 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.
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/peo…
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.