Good for Apple. In my opinion they are laying the groundwork for reducing technical debt.

Objective-C had a good run. I haven’t used Objective-C in over 10 years but I have used Swift about 10% of the time in the last four years. Swift is a nicely designed language and I could see it supporting Apple’s business for many years.

Will Swift ever be a primary language on Linux? I would say yes, except now that Rust is used the advantages of also mixing in Swift are diminished.