And any changes or not, Riviera and Reflections will add thousands more looking for BCV at 7 months.
Riviera and Reflections also provide two new destinations for hundreds-of-thousands of members. It alters everyone's preference list from trip to trip.
Perhaps I'm unique but I never really viewed BCV as the holy grail of DVC accommodations. These days I don't see a lot of angry posts/comments from people who had unrealistic expectations for BCV availability. I'm sure it is consistently one of the tougher resorts to book, but we managed to book a week in 2018--first time we'd been to BCV (or even tried) in more than 10 years.
As for the topic at hand, I'm not sure what else DVC could even take away from resale buyers. They can't alter room setups or restrict access to resort amenities. There is doubt over their ability to tinker with the 7/11 month booking windows. If anything, they would probably have to go the other direction and offer MORE to direct buyers while excluding resale. It would basically take the form of expanded member perks, in the vein of Moonlight Magic. Use your imagination: extra fast passes, free refillable mug, early entry, early ADR bookings, etc. But every one of these possibilities has a real financial cost attached to it, or a direct impact on park operations (FastPass).