OP here; we're still mulling this over. We know we'll take a hit on the BLT points, but will end up with more BWV points for the cost. The longer time period until expiration isn't a big issue to us; we're in our early 60s and our kids haven't got the Disney bug like we have.
More worried about the headache of the 7 month window and also tryng to decide if we should have two use years! We've been
DVC members for 10 years at BWV and thought we'd love BLT, but it just isn't us. To me, walking back from Epcot to BWV at night is the best feeling in the world.