How many of todays artists could hit those crazy notes that john was hitting,night after night on slippery tour? very few, its incredible that he sounds as good as he does considering what strain he put into his vocal chords.
I think he still sounds great though, i went to see them last year and his voice was fine.
So the next generation of bonjovi songs will be sung in a lower key, who cares as long as the songs still rock.