It is true that OKW and SSR used to be the last resorts to run out of rooms. But not true any more. Basically, the larger resorts are the last to run out of rooms. SSR usually is the last (so far). BCV is usually the first resort to run out. BWV, BLT, VWL, and Tree House at SSR run out just about as fast, just somewhat easier than BCV. AKV Jambo House would be next (but concierge at Jambo runs out fast). AKV Kidani Village and OKW are about as hard (or easy) these days.
Anyway, at the 7-month window for early November and early December, I don't see a problem. Not at OKW, and not at most resorts. And in case you don't get it on the day you call, just waitlist it. It should come through in a matter of weeks.