I just don't see Izzy doing a full tour. He'll show up every once in a while just to show us that he's still the best. I think it'll be Fortus. Slash loves him and he's got the feel. Fortus finds that off-beat pocket better than Gilby ever did. Don't get me wrong, I love Gilby, still listen to Pawnshop Guitars from time to time, but he's kind of limited in that Stonesy world, ya know? Fortus can play anything, he's on an nsync record for gods sakes. He's versatile; I think he'll keep up just fine.
The thing is, fortus plays more than izzy and gilby. They could play Chinese Democracy songs if he was there. That's what's great about GNR from 2001-2014. They have there own way of playing. It's way different from Old GNR, but I think it's better. I love how he splits rhythm and solos, very good.