You know they can always bring him back because the Doctor travels through time and it may just be part of a time line that he did on one of his jumps into the future.... I wonder if they had enough people asking for it if they would do that?
no, I mean ...the doctor's travel to the future all the time...all they have to do is show us episodes of adventures the Doctor went on when he was still in that same form.
they don't have to meet up with the new version of the Doctor... after all how did all that stuff happen with River Song being "married" to the Doctor when he was in different forms?