Re the bit about Riviera resale only using Riviera, someone did put up a live chat with official looking info which seemed to confirm this.
This is about the future, they want to kill resale. They decided they are leaving too much skin in the game on resale. They want it cheap to ROFR and want all new buyers to say ''No thanks, one resort only? Give me direct' and for those still prepared to buy it because it's cheap, they'll just ROFR it. They will destroy the resale market- in 30 years. This may also allow them to build even more new DVC.
They don't want to create another resale market.
Of course, if it all goes wrong and hits direct sales badly (and I don't think it will, majority of buyers are totally uneducated), they can just reverse it.
So they are in a no lose situation.
Zavandor does make a good point above- DVCMC is meant to act in the interest of its members. If it were a standard condo association, they'd be insisting if you want to use our club, you had better let all our members use yours or It's no deal.
In a genuine at arms length negotiation, DVD would have little choice but to acceed to that request, otherwise their new resorts don't look great to buyers who are shut out of the 14.
But the people running DVD and DVCMC are exactly the same. Never used to seem much of an issue, but now it's deteriorating into typical timeshare, it does.