Well if you look at Vino, he's 34 now and his REAL retirement is lurking just around the corner. Last summer lots of people were saying that the 2007 Tour was probably (one of) his last change(s) to win the Tour so, with or without dope his body is getting older. He just might be able to take a shot at the 2009 when he's 35 but any later than that and his chances are getting pretty slim. And we can be pretty sure he's not going to be a domestique for anyone else
For the team it makes absolutely no sense to hire Vino back since they have all the top riders they need, they just have to get invited to the Tour to win it. And I doubt the sponsors of the team are willing to take such a risk as to get banned from all the bigger races of 2009 too, they're businessmen after all.
I think Vino will just ride the Olympics and that's it - his last attempt at eternal glory in Kazakhstan