Objective-C had some minimal adoption outside of Apple (probably due to NextStep nostalgia), so if Objective-C managed to get some traction, Swift will do it to

Objective-C had some minimal adoption outside of Apple (probably due to NextStep nostalgia), so if Objective-C managed to get some traction, Swift will do it to, probably. However, Apple's history is very much stacked against Swift becoming a mainstream language outside of Apple's platform.