I read somewhere - can't remember where - that the average DVC family owns their membership for less than 10 years. That certainly makes sense when you look at the thousands (and thousands!) of contracts which have been put on the resale market.
If I were still in my 20s (anyone know how to make that happen!?), then I would be certainly tempted to buy a newer resort. However, if I preferred one of the older resorts, then I would hopefully realize that I could buy resale for a much lesser cost today, get many years of enjoyment out of it, then in 2042 (if I still wished to do so), I could either pick up one of the now older resorts for a very low resale price or look at several other options which Disney will, I'm sure, have at that time.