Those who point out that things can (and do) change are correct...we bought in 9 years ago and patterns have changed quite a bit since then...we're 7-month (usually less) bookers most of the time, because I simply can't commit (except at T-giving) to time away 11 months in advance...
Having said that, I've stayed at BLT multiple times, in SV and LV studios--w/a couple of trips using two studios because I brought guests...but there also have been times when I checked availability there and there wasn't any...so if you "always" want to be at BLT in a studio, I think you'll find availability is an issue (for both SV and LV)...but if you just "mostly" want to be at BLT and if you're ok w/the points for a LV rather than a SV villa, I personally would risk it and buy my points at a lower-cost resort--if for no other reason than that I can get more points for my money, which means more and/or longer stays! Plus, if you're like most of us "Disney addicts," you'll find you want to try all the resorts; you'll fall in love with all of them (for all different reasons); and you'll want to mix up your trips and stay in different areas and different resorts every few trips...if that happens to you, your 11-month booking advantage at BLT loses some of its "necessity."
Plus, now that GFV and PVB are online/coming online, no longer is BLT the only monorail
DVC...I think it's likely that for the next 2-3-4 years, demand for GFV and PVB will increase availability at BLT and VWL...there probably won't be a lot open deep into the 7-month window, but booking right when the 7-month window opens probably will result in availability more often than not (leaving aside certain highly competitive times--first two weeks of December, for example)...
One last thought: this may be no more than semantics, but DVC accommodations differ in significant respects from hotels...since you referred to them as hotels I thought you might appreciate knowing this. For example, DVC villas do not get daily housekeeping (unless you request and pay extra for it). There is housekeeping on Day 4 of an 8-day (or longer) stay...and for shorter stays, housekeeping comes in to change towels and empty trash on the fourth day of your stay. But that's it. Also, there are no rollaway bed possibilities, in most of the resorts there's one bed and a pull-out sleeper sofa and in some a pull-out sleeper chair...there's a kitchenette in the studios (and a full kitchen in the bigger villas)...it's really not all that hotel-like (at least in my experience), even at the resorts that are attached to hotels...
Hope this info helps. Good luck!