All DVC resorts, theoretically should operate at near capacity at all times. That is what makes the point based system work. Largest resorts would fill up last, but should still be nearly at capacity between members and cash reservations. I'm not sure your BCV has any greater percentage of wear and tear than other DVC resorts. I think eveyone pays about the same wear and tear regardless of where they own...it is just that certain fixed costs for larger resorts are spread over a larger group of members, hence the difference in dues. The OP does have a point though, I would assume that the monorail costs at CRV (if built) would increase the transportation costs per member that owns there.
There is also no guarantee that having the ability to trade to other DVC resorts will remain part of DVC, it can be discontinued at anytime, at the discretion of DVC, and they can restrict us to using our points at our home resorts. I wouldn't expect to see them put that into effect, unless a resort is either devasted by a disaster or they use it to control occupancy as we near the end of our ownership contracts.