I'm pretty sure resale pricing goes down, at least in the short term. But here's the unknown, as I see it. The tariffs will likely produce inflation, which gives Disney two options. They can raise DVC direct pricing in line with inflation (which is more or less what they've done for years, sometimes with a small extra bump): this will reduce contracts sold but it will preserve the premium perception of the product, which may have benefits longterm. Or they can start discounting through incentives to attract larger sales and create a reasonable alternative to the resale market. And here, if I had to take a guess, I think DVD will discount at least one older resort (maybe AKV...possibly Aulani) but will keep high prices on the frontlist to create an image of exclusivity there (Poly, RIV,
Disneyland Villas, etc.). My observation: DVD doesn't always react the most reasonably to market conditions and often waits until the moment has passed to announce big incentives (for example, the fire sale on GF was pretty clearly related to pandemic economic conditions but happened after the pandemic was over.)
I remain open to other perspectives.