It's pretty far ahead right now but I think this trend is going to start to reverse pretty soon. The combination of Apple loosening their restrictions, technology like Appcelerator getting better and Android's success will make it hard for Objective-C to continue its rapid growth.
I wrote my first commercial Objective-C program back in 1988 on msoft DOS -- 22 years ago. I am guessing it would probably be a dead language by now if it had not been for NeXT/Apple.