Disney stock almost doubled in value this last year (up 86%), but still I will never invest in stock again - only gold and real estate. But with DVC, at least you'll have an asset you:
#1 - can enjoy
#2 - can rent out if need to save (or even make) money for a few years
#3 - don't need to manage much, and
#4 - can resell for near what you paid for it, or even for a profit (if not near end of term)
On #4, a lot of buyers who bought in 2007 found that when they needed to sell in 2008 or 2008, they couldn't sell for near what they paid for it. Some people were taking thousands in losses. Plan on it taking several years before you make up "what you paid for it" - particularly if you buy direct (although people buying BCV in 2007 were paying near retail - especially for small contracts).
Similarly, if you consider renting to pay dues for a few years - over the past two years there have been a lot of points available, and a lot of bargain hunters comparing a DVC rental with Disney's offers of "Free Dining." As DVC continues to grow, there are more and more points available on the rental market - some of those points held by people who paid $60 a point for their contract and really do just need to cover dues and are making a tidy profit at $8 or $10 a point.
Its a risk analysis, but I wouldn't weigh "being able to rent" as a certainty, nor "being able to sell for what you paid for it." It is definitely something that can give you enjoyment and it is pretty easy to use. But that doesn't mean that its a wise financial choice for everyone.