OpenG, I'm not questioning Mick T's ability to play, I'm sure he's still great.
But the point is that he will never play with the Stones again, may be for a show or two, but definitley not on a regular basis. And one reason why Mick's not coming back is the physical shape he's in. He looks like a drunk, old, fat man - and you are right, the Stones shows are sometimes very much like a Vegas act, and they won't replace Ronnie with Mick. Simply because Mick would stand there like a statue playing his solos and he wouldn't look to good..
He isn't "cool", he has no stage presence. In the early 70ies nobody cared, probably the girls thought he was sweet cause he looked so shy and innocent, but this attractions is gone for sure.
Mick T's career chance are gone. He will continue to play in small clubs with local bands and I'm sure his playing will remain great and the insiders will continue to adore him, but he will never be more than that. And even if it sounds harsh, he will never be in a big list with the best guitar players, because the few years when he was recogniced by a wider public was some years in the early seventies. He failed completely becoming a succesful solo artist and there has to be a reason for this - and one reason is for sure that he is not a very talented songwriter.
He should have focused on playing with big names instead of trying it alone. That would have been the only chance for him to be successful
Anyway, don't think that anyone in the band consideres to fire or replace Ronnie, but I think that he was told to keep in "shape" for the next tour, that's why he's playing with everyone around (Charlatans, Thrills, J.Beck, Rod, ModAid,...)
We simply have to live with the fact that Ronnie is a not as good as he was in the late 70ies/early 80ies. We can just hope that his playing will improve. I'm really curious about his performance on Sunday in London.