I would say that getting a resort at 7-months is impacted by these factors, in decreasing order:
1. Dates: Specific times of the year book up fast and may have slim pickings by the 7-month window.
2. Special Villas: OKW GV's are popular due to the low point structure and tend to go early. BWV Boardwalk view villas are popular. Same point structure as the regular preferred view but boardwalk view.
3. Limited villas: BVW Standard views have lower point structures, but are limited in quantities so go quicker.
4. Location: Epcot/MGM is popular and thus BWV and BCV are popular due to their proximity to those parks. VWL has a special draw of it's own, with boat service direct to MK.
5. Resort size: The fewer the number of villas available, the quicker they fill up. Thus VWL, BCV, BWV will go first. OKW, being the largest resort will have availability for the longest periods of time. SSR may eventually be similar, and if ever built, Eagle Pines may be in this category also.
6. Newness: For the next year or so, SSR will hold a certain draw because it is new. Many members, like myself, have stayed in all the DVC resorts over time. We're going to want to experience SSR also.
7. Everything else: Personal preferences by families. Things change all the time. Who know, perhaps the fact that pool hopping to SAB no longer applies, and OKW is putting in a slide, then OKW may become more popular than ever before. The larger accommodations there have always been a prime draw. Bottom line, if you can be flexible on dates and resorts, then you'll be able to find something somewhere at 7-month, always. In other words, I would be confident to guarantee you that whenever you call, at 7-months, you will find that not every villa in every resort has already been booked for all dates for the following 7-months, leaving absolutely nothing left.
In other words, at 7-months, there will still be plenty of choices still available to you. Probably not a BWV standard view Studio for New Year's Eve, but definitely a 2-B/R OKW villa for the 3rd week in January, or September.