Kids may not remember this but you used to be able to access the Cocoa frameworks with Java...
Seriously though, a lot of developers will try and keep it around as long as possible because of existing codebases. I bet that even includes developers at Apple.
Also, though I haven't actually looked very much into Swift yet, from what I've seen, I disagree that Swift is just a syntactical mask on top of Obj-C. It looks to me to be following a similar approach to Rust and Go, in that it combines features of many different languages, object oriented and functional alike.
"No. Languages take a while to die. C is still around."
That is unfortunate. You can't compare a language supported by mostly one company as Objective-C against one of the most important languages around.C is widely used and a not dead, not even wounded language. Thousand of companies use it every day in core systems, embedded systems...
I am really wondering why you have suggested C being dead or on his way to die...