Unfortunatly I think that too. In their last documentary, It really seemed that he was enjoying much more his motocycles rides than the shows (I know he was never really a fan of touring, but still...). He even said that he regretted to accept do the tour. Even after the final show, he runned from the stage to do whatever he always did, while Ged and Alex stood together, kinda conforting each other, in a such delicate moment. Sorry, but I've got the enormous impression that Neil was reaaally disconnected from the band on R40 tour.
About recording again, I also believe that will not happen. Neil always sets a very high bar to his performance and given that nowadays he is basically a retired drummer, I think he believes that he will not deliver a studio performance at an aceeptable level for his standarts. Neil is a complex guy and a bit strange IMO (I'm a big fan, but, despite all the things he went through in life, I already thought this before it all happened).