With Nadal out, it certainly opens the door a little further for Federer but I don't think you can look past anyone, particularly Raonic. Murray and Djokovic are still formidable opponents still alive.
It's incredible to me that the last 14 championships have come from Federer, Nadal, Murray or Djokovic. It took a 5-set classic to knock Nadal out and the other 3 are still very much alive.