I think people are thinking a little more long term when they buy into a timeshare. These prices have been climbing since well before the most recent hurricanes, and it is not like people are saying to themselves "Should we commit $20,000+ to Disney World over the next 25+ years, or $2,500 on a trip to Vegas for the weekend?" Most people who are spending cash on a timeshare can afford both. Also, if there was a direct correlation to recent news and Disney World attendance, then they would have had record attendance numbers this past summer, not relatively flat ones compared to previous years.
I believe prices are rising, and will more or less stay this high, for two reasons. One is that the economy is finally pretty strong again, and people feel comfortable spending a good chunk of their savings on leisure. People who are smart enough to buy resale are typically also smart enough to know when it feels safe to commit that much money to a purchase. A better economy means that more people have that sort of money, so demand has gone up.
Also, the strength of Disney World, and
DVC, has only been growing over the past few years. The theme park division is becoming a bigger and bigger piece of the Disney corporation's pie, and they are starting to invest some of that back into the parks. This is adding to the excitement of what is to come over the next few years, and beyond. Also, Aulani opened since the most recent economic downturn, and now that more people have more money now, multiple vacation options, even if they are still relatively limited, add to the overall value of DVC.