Would it be substantially more expensive? If so, that means their market changes. Maybe that market exists, maybe it doesn't. Let's assume it does. But, moving to that market means re-tooling their entire organization---they'd sell it differently, they'd operate it differently, etc. That might increase ROI, but right now
DVC provides some of the best margins in the entire Parks & Resorts segment. So, if you're running the show, the biggest thing you worry about is regression to the mean---companies very rarely disrupt their most profitable line.
It's worth thinking about examples of companies who have though. You could argue that Apple did moving from the iPod, a huge success, to the iPhone, creating an entire market segment in the process, but cannibalizing the iPod business, a business they are no longer in.
http://www.washingtonpost.com/lifes...3525b2-38f5-11e4-9c9f-ebb47272e40e_story.html
Doing the same thing within DVC could be pretty brutal---how many would sell? Potentially many if the costs escalated too quickly. They'd almost have to create a new tier of product. That's not unheard of in the timeshare business, as Wyndham did it with their Presidential Reserve line, but it's positioned mostly as an upgrade to current owners.