I hate to say it but if I'm honest, Keith doesn't really ever get out of first gear on either his 'solos' or his ' rhythm. Since the 81/82 tour he has gradually took more of a back seat and allowed backing musicians and Chuck to fill the gaps. In fact his solos have at times just been plain embarrassing - I think the term noodling is even too generous. We will never see Keith play a guitar like he used to, the combination of physical wear and tear coupled with a seeming lack of interest in playing guitar has firmly closed that door.
This doesn't mean they can;'t tour again, let him do his posing and give the work to Ron and maybe some guest [players.