1) It was DISNEY WORLD RESORTS not DVC that has stated they will cancel FP+ when reservation is cancelled. DVC reservations do happen to also fall under FP+ rules, but there is nothing that says Disney even has to let DVC use FP+...this is negotiated between the two entities.
2) DVC and Disney are two very different entities, legally and also in practical terms.
3) Rules are made to benefit the majority of membership, not the minority of membership...would you be OK if the people with 10000 point or more, a minority of the membership, could book at 12 months out instead of 11...or would you be complaining?
4) The negative impact of walking IS on the minority of members, those trying to book the most popular reservation dates, in the most popular rooms (studios). No matter what, there would never be enough studios for those dates to satisfy everyone that wants them.
5) Walking violates none of the current rules. DVC management has nothing to gain, and Disney has nothing to gain by trying to do anything about the problem...the rooms will be filled with members...it doesn't matter to Disney or DVC which particular member is in the room.
6) And like it or not, purchasing a fixed week IS a solution to the problem. That is likely the Disney/DVC answer to limited availability for none fixed week members...reservations are limited by availability, and is subject to DVC booking rules. Period.
7) Prior to the current check-in day + 7 booking method, it was far more difficult for most members to book high demand periods, most would end up with a hole somewhere in their reservation. Most members prefer knowing at the time of booking if they have the reservation, and whether they will be able to add on to complete the reservation, so they can make flight arrangements, and so forth.