Worried you over there, did I?
Most people to date have had little problem booking seven months out - as long as they aren't too picky and can be flexible. Most of the time people have even gotten pretty much exactly what they wanted - with the exception of OKW Grand Villas and BW Standard Views (and perhaps now BW Views) and some other "hot commodities" (Epcot resorts during Food and Wine, VWL between Thanksgiving and Christmas, Vero Beach Cottages over Spring Break). Even then, some people have been fortunate to get these hot commodities at seven months.
Sometimes getting what you want involves some time on the wait list, sometimes it doesn't. And, of course, calling at seven months is better than waiting until five months out.
But if you have your heart set on a two bedroom at VWL in early December, you may discover there is a lot of availability outside your home resort, at OKW or BWV - just none of it at VWL. Or only one bedrooms available. Or you want to take advantage of an OKW Grand Villa for a family reunion - and you may need to take a studio and one bedroom.
However, as more and more
DVC members join the program, the competition for the smaller resorts (and other limited commodities like GVs and SV rooms) at seven months should get hotter. SSR is a big resort, and if many of those owners take advantage of the flexibility of the program to stay outside their home resort (plus the OKW/BCV/BWV/VWL owners that already do) it is going to be harder to book. There are only a few hundred rooms at VWL and BCVs. I'd anticipate that VWL will always be hard to get in the Fall Winter (when the theming is really really nice) and that BCV is going to be really hard in the summer (when SAB has the most appeal and the theming works best), but I could be wrong.