Cathy, I am sorry to hear about your shoulder. Can't say I have any experience with that part of the body, but I would try the PT rehab route and see if you can salvage part of next season. Sometimes, as others have said, these decisions are made for you, by your body. It su*ks, especailly when you have racing goals. My friends don't even understand why I was upset about not making my 3 000 mile goal last fall and that is just a personal goal, not racing.
Try to avoid surgery...

Robyn