I have a friend that's middle-management in the
DVC organization. He got us a tour of the Bungalows back in October. At the time, he said that the demand for the bungalows is high enough that DVC was pulling the "open house" bungalow because they needed them all for inventory. I was surpised, because like most people I was thinking "how many people can afford these to justify this many points per night?"
Out of curiosity I just checked the availability category. I notice that while it's fairly booked in June, lots of availabilty from July 5th-September, only 2 days booked up, but then actually in October and November the bungalow inventory is pretty thin - there's some days available, but about 1/2 the dates are taken. Beyond that though - full availability. I am pretty sure you are right though - those bungalows would almost always be available at 7 months with rare exceptions. (Though when you look at the studios - beyond 7 months there's near 100% availability as well.)
That said, Disney must see them getting used, or else they wouldn't have built more at CCV.
I still think availability at 7 months will be common at the Poly. There are 20 Bungalows and 360 studios (60 of which are lake view). The 20 bungalows account for about 20 % of the total points at the Poly. Let's say only 5% of buyers at the Poly want the Bungalows, that makes 95% of the points to fill 80% of the available space. But of those buyers, there is likely a quarter of them that are going to want to try other resorts, or 1 / 2 bedrooms, or the like - this is probably a conservative number, that number will get higher the longer they own there. That means 71% of the Poly buyers are looking to stay in the studios, but 80% of the rooms are studios. So on average, there's at least 9% excess studios (or 35 studios) available on any given date at 7-months.
This is getting super off-track but a point I keep trying about why buying CCV is a terrible Idea. CCV has something like 35% of their total points in cabins and Grand Villas, and only 9% of the points in studios. However, the average contract size sold for CCV so far is 140 points - about the same as the average Poly contract. At 140 points or less, are those buyers planning on Cabins or GV? No. CCV (and DVC ownership in general) skews greatly towards studios. The average resort at WDW has 20-25 % of it's inventory in studios or lock-off studios. VGF had only 14 % of it's points in studios, and if your a VGF owner you know how near impossible it is to get a studio unless you book at 11-months. Imagine what it's going to be like at CCV. There are going to be a LOT of very angry CCV owners out there in about 18 months - especially those that payed all that money and want to go in the fall and are stuck at SSR at 7 months.