I still hope that one day Roger and Brian decide themselves singing the songs on the tour. They would consider it.
I guess John accepted back to the band if they stop to put any one to sing. XD
as much as I want Brian and Roger touring together and sharing vocal duties for smaller audiences (wich would be awesome), I´d give up everything for seeing John joining them just for one farewell gig ... if that gig was later released on DVD/BR, of course :D !
What ought to happen is that Queen is dis-banded at the earleist possible opportunity and that Brian and Roger then resurrect their own solo careers.
End the nonsense now.