I'd say the odds are pretty good. All four buildings will be open, but DVC will only have sold a fraction of the available points at the resort.
Even if you can't get it when you first call, I'd try waitlist. There may be SSR owners who cancel ressies if they are able to move to another resort at 7 mos.
I had a reservation at SSR for 11/6 - 11/13 but I changed it to 10/16 - 10/23. I was told that there was plenty of 1bdrs available for my october dates. I did not ask about the november dates. You can call and check with MS. I'm sure they won't mind.