Honestly, I think they do need to kiss Dobby goodbye. If they don't, its because they know something about Bishop's injury they haven't been telling anyone.
Goaltending depth in a flat cap year is not that feasible, and we just have to hope Bishop comes back strong. It may not be an all or nothing, as in he doesn't hit the ice much next year. The more likely scenario is that he is less than Vezina effective next year, due to age and injury recovery.
They have no reason to doubt Otter as a starter or 1B, however it works out, and there is no chance they put an NHL caliber goalie back in the AHL, especially on his entry level contract. Of course, he could turn out to be a one season wonder like so many other goalies have been, and that, and/or combined with a declining Bishop will put us back on the goalie carousel.
If the worst happens to both of them, we are back to the bankruptcy years in goalie quality, but even so, they have to play the percentages, and keeping Bish and Otter is the highest percentage move, if not a complete guarantee of goalie stability.