Then when he dies, do we still have a state of sede vacante until Francis dies or resigns? (He's not going to resign, not until everyone has given him his way on the TLM, so I guess that kind of narrows down the options.)
Or, assuming he is a Catholic and is eligible to be Pope, would he then become Pope due to (near-) universal acceptance, the acceptance he already has, even though, if Benedict is still Pope, that acceptance is a moot point for now? IOW, would (near-) universal acceptance, when Benedict dies, be enough to "make him Pope", absence of a valid conclave notwithstanding?
Or would it follow that, since Francis was never validly elected (due to Benedict having never ceased to be Pope for whatever reason one might advance), the only way a new Pope can be had, is for there to be a valid papal election? (Quite obviously there wouldn't be a conclave to "make Francis Pope now".)
Again, all of this assumes that one accepts Benedict as having been a valid Pope in the first place.
Thoughts?