I think the important thing is that Apple doesn't include features for the purpose of having them. It's frivolous to have a feature that doesn't work properly or can't effectively be leveraged by developers. Apple patiently fleshes out everything before it's publicly released. So while Android's OS might technically be more advanced than iOS, in practicality and implementation iOS is the best mobile platform. For example, look at the front facing camera. iPhone 4 wasn't the first to have a front facing camera, but it was the first to have one that simply works — and that's what consumers want.

So, to answer your question, no: iOS hasn't irrevocably fallen behind. Has it fallen behind, technically? Yeah, probably. Irrevocably so? No.