These are very good summaries of the booking challenges at 11 and 7 months and still quite accurate:
drusba's 7 month booking summary posted on 10 23 2016
drusba's 11 month booking summary posted on 9 23 2016
skier_pete's Predicted Booking Patterns posted on 6 13 2015
Booking BCV at 7 months is easier if you want a 1 bedroom than a studio, but even the 1 bedrooms go very quickly at 7 months during certain times of the year. Competition to get into the near park resorts is definitely increasing and will continue to do so. Getting more than 2 or 3 consecutive nights at 7 months is often not possible without waitlisting, and even then.......
Lots of other people love BCV, too. That's why BCV contracts are selling for a relatively high price compared to the other 2042 resorts. Those buying the BCV resale contracts are doing so to stay there and they book before the 7 month window opens. If you wouldn't be happy staying elsewhere when you don't get into BCV, buy there and be sure to book at 11 months.