Ronnie doesn't have the balls to do a solo tour, he does the odd night like at the Ambassadors for charity etc though, but i would very much love to see a Ronnie solo tour, especially the way he is playing and performing now, actually he and Keith would be amazing together as we can see from Keith's set at most Stones gigs. The main problem and probably the reason Ronnie doesn't tour solo, is he can't sing, but with Keith mixing it up with him and maybe take someone like Sasha or Lisa with them and hey presto, could be some golden show's if Jagger ever calls time on his band.
I think they don't want to upset Mick, hence they never got it together again properly since the New Barbarians. Mores the pity.
As for Rod Stewart he's full of shit, always saying he would tour with the faces, well he's waited so long half of them are dead now. But still if Rod, Ronnie and Kenney ever get it together it will be fantastic, as were the gigs with Mick Hucknall standing in for Rod.
Incidentally just read a great Autobiography from kenney Jones. Highly recommend.