Swift as a language/ecosystem does seem to check all the boxes in contrast to other modern, mainstream languages; it looks, to me at least, like a much more ergonomic alternative for building applications compared to Rust and Go. It's considerably faster and more type-safe than Python and Ruby. And it has a drama- and shenanigans-free licensing model that I personally am much more comfortable with as opposed to the shitshow that is Java (and, to a lesser extent, .Net).

I've been reading lots of Swift docs/articles, and made quite a few book purchases from raywenderlich.com and hackingwithswift.com. My "gut feeling" tells me making the investments to become proficient in Swift, and eventually mastering it, will pay off big time.

As a web-focused developer, I must admit I found Objective-C and UIKit intimidating, but with SwiftUI, Apple seems to be lowering barriers to entry; if you know something like Ember, Vue, React, or Angular, you won't struggle too much trying to grok SwiftUI.

With Vapor becoming a mature framework, and Apple giving its official blessing for the development of server-side Swift libraries and tools, it does seem like we may soon reach critical mass on the server, and there is a lot of appeal in being able to consolidate and develop with one language across the stack.

If we can get a Swift-to-Kotlin compiler and a Swift-to-JS compiler (there are already Swift-to-HTML DSLs, and I have been experimenting with a Swift-to-CSS DSL - with my limited proficiency in the language - and it does not seem totally impractical), it's not unreasonable to imagine Swift becoming a "rule them all" language (I remember reading somewhere that Chris Lattner said his goal with Swift was "Total World Domination" and didn't think it was that far off, but can't find the source now).