Shows they are willing to change the rules to make re-sale less attractive. They wouldn't want to make
direct purchasing less attractive. Not to mention, it's much harder contractually to change the rules for a direct purchase.
Yes, future resorts *might* not play by the same rules. But
it's in Disney's best interest to keep them playing by the same rules. Because switching rules undermines new direct sales. (why should I buy new if I can't trust Disney? If I'm buying in 2024, and they just betrayed all the pre-2024 purchasers, then how do I know they won't do the same to me?)
25 years of reliability is the big selling point of
DVC... It's certainly possible they mess with it. But if they do, it will create both contractual problems and major marketing problems.