I actually think DVC is thinking long term. Most likely what the "suits" wanted to do with the start of Riviera was to eliminate any viable resale market by limiting all resale purchasers, including of the 14 resorts that existed before Riviera, to reserving only their home resorts. That is where DVC wants to be so it can both sell new points at a very high price while being able to exercise right of first refusal on resales at a low offering price, caused by the resale restriction, so it can then make huge profits again selling those points as new. What probably occurred to that original idea for a major restriction was that its lawyers told DVC management that it could not possibly get away with limiting resale purchasers of the original 14 resorts to reserving only their home resort due to terms in the POS's for their resorts that declare that resale purchasers have the right to reserve DVC Resorts other than the one they own
As I have noted before, it is likely improper for DVC to do even what it is doing now by making Riviera a DVC Resort but preventing post-Jan 2019 resale purchasers of all other resorts from reserving it, but that decision left all pre-Jan 2019 purchasers able to reserve all resorts, including Riviera, and thus limited the risk of a lawsuit being pursued. Unable to completely destroy the current resale market for the original 14 resorts, DVC likely looked at it as long term. The "suits" believe DVC will be around for a long time, well into the next century. As the end date for resorts starts in 2042, DVC will be able to sell those resorts new under a new POS using the same resale restriction as the one at Riviera. As time passes all resorts will prohibit resale purchasers from reserving resorts other than the one they own. That should eventually result in resale purchase prices to fall or at least not rise as time progresses, giving DVC the ability to exercise the right of first refusal at favorable prices and then resell the points at very high prices. Moreover, if the resale restriction eventually appears to be doing any real injury to DVC's sales of points (and so far that does not appear to be the case), DVC has options available to increase sales while keeping the resale restriction, e.g., it could offer resale purchasers the ability to convert some of their resale points to having no reservation restrictions by buying some set amount of new points from Disney.