I don't think it's that dire if Morse misses a bunch of time. They have Corey Brown down in AAA along with Bernie and Morse. They will miss him some, though.
I'm more concerned about missing Morse than Desmond, personally. I'd love to have both, but the offense looks so different just with the threat of Beast Mode blasting bombs. Definitely think we'll be seeing Brown again soon though, which is a fine callup.
I doubt Desmond's seriously injured any way. Morse's outlook doesn't look so good to me.