IWhile I'am not happy that he is injured, I'am happy that the change for the title finally took place. It's clear that the WWE wants to milk Cena and his merchandise for all it's worth but in the same I was tired of him crapping over so many people (after they dominated him only for him to FU them at the end). That's not to say Cena hasn't worked to keep his title, he has, but a change was needed, it took an injury to finally make it happen.
Would Cena have retained against Orton at No Mercy? Maybe, maybe not.
I thought for sure Cena would have dropped the title at Summerslam but that didn't happen. Now RAW has quite a number of different people to throw to feud for WWE Title which will make RAW a better show (if it wasn't already depending on your point of view).