I think something that many people are overlooking with regard to slow VGF sales is that
DVC decided to announce the Poly tower right around the same time VGF went on sale, which probably stifled the initial surge in demand.
Riviera's appeal would be similarly impacted by the existence of VGF and Aulani, and the looming availability of VDH and Poly.
Are there people who specifically said "hey I really want a monorail resort and planned to buy VGF, but I'll wait on Poly and buy Riviera today instead"? Probably.
Is it a statistically significant population?
Aspects like price and contract duration are meaningful differences between the resorts. Those are valid points for discussion. It gets a little stickier when we layer our personal biases and assume that a large number of others would feel exactly the same way.
I'll always go with the option without restrictions - not because of resale value - but because 20 years down the road when multiple contracts have been resold, the competition to get into your own resort will be tremendously hard since all those resale owners cannot stay anywhere else/move at 7 months, but all other direct owners can come in and stay there at 7 months. It creates disproportionate demand down the road.
That's only one side of the equation. You're forgetting the other side: resale buyers at *every other resort* are blocked from coming into the restricted location.
Yes there are currently some Riviera resale owners who can only use their points at Riviera. However every resale contract which changed hands over the last three years at
every other DVC location is unable to book at Riviera.
EDIT: To add some numbers to this, over the past 22 months, 21,700 riviera points have changed hands via resale. About 1000 per month. If it continues at that pace, in 20 years there will be about 240,000 points in the hands of restricted resale owners. That's 3.5% of the 6.7 million points. If that resale pace doubles (to a rate comparable to BLT), that's still only 7% of points in 20 years.
Meanwhile, over those same 22 months, all other resorts totaled 587,000 in resale transfers. That's more than a half million points which cannot be used to book riviera. In 20 years, the number rises to 6.4 million points blocked from RVA reservations vs the 240-480k estimate which can only book Riviera.
Only a fraction of those 6.4 million would even attempt to book riviera so it's certainly not an apples-to-apples trade off. DVC will continue to sell "new" points which can book all locations. 20 years ago, there were only about 22 million points which had the ability to book BCV and BWV. Today that number is over 80 million. (Along with a slew of other appealing resorts to spread the demand.) Resort competition is constantly evolving.
Still I hope that illustrates how Riviera will be affected both negatively and positively by the resale restrictions.