Jon uses many vocal, performance and production tricks to make the show go as well as it does given his vocal limitations. Some types of singing are harder on the cords than others and given the 30 years of 2+hour performances, it is too much. He has mentioned ENTs, vocal coaches, etc. in interviews. I think he does a lot to keep the voice going but it is beyond bringing it back. He needs more time between concerts for one thing and that is not economically feasible. I agree with a previous poster that he sounds reasonably good and the real problem is how contorted his face looks trying to sing songs that he has problems with. It is downright painful to watch. I once said that when Jon starts losing his looks and his voice that Bon Jovi wouldn't be able to fill arenas but I guess he is about to prove me wrong.