Is it dying? I think it's still pretty popular for app development isn't it?
I was pretty excited to hear that Ladybird is doing a lot of stuff in Swift, because I think it's a pretty decent and fast language and I think it'd be pretty neat to see a browser written in it.
Well if you wonder you should conduct some simple research, but be prepared to have your opinion challenged. Swift ist doing very fine and much more popular than ObjC (again, if you don't believe it, invest 5 minutes into research).