He hasn't got it in him anymore. When his voice was super shot to hell in 2006 he adapted his voice and sounded different in 2008 - almost sounded like Cher! It was the technique Jon was using to get the notes out that changed and how he used his diaphragm. He was able to belt out these songs and Blood Money and hit the notes.

Now Jon has run out of options into how to get those notes out. Thats why you'll never ever hear songs like Living In Sin, Something To Believe In, These Days, Blood Money from this moment on. I mean he even struggles to sing the songs we take for granted - Bad Name and Wanted. He physically doesn't have it in him to reach those notes. He can have all the energy and charisma on stage - and he will always have that. But his fundamental tool is wrecked.