I'd be surprised if that affected the
DVC resale market. In the end DVC is about a room and nothing more and one shouldn't be counting on anything else or assuming that everything will continue as it is. If other Disney policy changes make a difference then DVC might end up being a sad disappointment in the future. Now with that said I don't really expect any big changes and what is going on in the short term will normalize moving forward.
Regarding the dining plan - we've gotten it exactly twice. Once when it first came out and again for a single night when we had a split stay. The numbers have never worked out and all inclusive feel isn't important but can be achieved for me just by having funds on a GC. You have to provide them something when you eat so it's just a GC instead of a MB or room card. We hate having dining dictated by a pre-purchased plan and every time I've calculated it would have cost us more.