1) The new Disney rule gives the resale purchase after March 2011 a disadvantage by not allowing Concierge Collection, the Disney Collection or the Adventurer Collection. I didn't see this mention in your article, although a post mentioned it.
2) I like how you made the point which many may not make the connection. For us (we might be the minority) but didn't like the home away from home feel ie kitchen, stove, etc. We also like mousekeeping (yes you can pay extra as a DVC). The mousekeeping gives us a fresh feel when returning from the parks. Plus the daily shampoo and, lotion.
3) Age, family size and length of contract is factor. If you buy once you enter your 40's you have to think if you will outlive your contract, who you will give it to, etc. If you are alive will you be able to go and enjoy it?
4) I like what you stated where many miss this factor, "things change over time". Will Disney still be making you happy in 40 -50 years? Will Disney make the investments that meets your life situation. Will your vacation style change.
5) I don't think anyone should go into it thinking they can sell their DVC. Disney has already changed the rule once and can change the rules at anytime that can affect the resale market.
The decision comes down to combo of money and life style. and lets not forget, Disney doesn't do anything that doesn't benefit Disney. All anyone can hope for is what Disney is doing benefits you.