SwiftUI is just one instance of a new feature in Swift called function builders that allows creating custom DSLs within Swift. As Swift’s cross-platform support grows, two things can happen: SwiftUI can be customized go work with the GUI toolkits of other systems, and other system-specific DSLs can be developed to take advantage of each system’s own unique capabilities and APIs.
I think the likely scenario here would be a swiftUI-like framework which is cross platform. SwiftUI is tightly coupled with Apple’s UI rendering system, and they have no incentive to make it easier to port iOS code to Android for example.
