Marketing is not important... Marketing is EVERYTHING.
Successful marketing programs create a need... and the person being influenced has no idea that they are buying as a result of marketing... they believe it was their own idea... and are acting of free will. None of us are immune... but I will be controversial and state something that none of us will want to hear -- I believe that those of us who are "into Disney"... are much more susceptible to marketing programs than most. Disney is an incredible marketing machine... and our desire to participate is a direct result, whether we realize it or not (and it is really irrelevant if we acknowledge it). Personally... I will often state that
I go to Disney because I love their execution to excellence... I really do "believe" this... but as a marketing professional... I know better
Now regarding the 2nd part of your question: I believe you are trying to imply that in fact... there is no long term demand for "home resort swap". I do not believe this is necessarily true. You may be right... but I honestly do not think so. Possibly the "fear of the unknown" (IE: controlling your reservations, and all the other arguments here against the proposal) will overcome the basic desire for a home resort swap... but I somehow doubt it.
The best anecdotal evidence that makes me belive this is something that people really would want is the fact that people do in fact buy points at multiple resorts. Clearly there are several advantages to have all of your points consolidated into a single account, in a single resort... yet people continue to buy into multiple resorts. I will use my personal experience as an example:
My primary resort is also my favorite: BWV. I LOVE BCV (they are tied)... and I have thought of getting some points there to use SAB. I would also like some VWL points just to go every 2-3 years for a December 1BR getaway with DW. However... some day we may have grandkids... and a OKW GV will sure come in handy... so maybe would should add-on there as well. Maybe every 3-4 years it will be really nice to get a savanna view... so maybe we need some of those too. GCV will be a great add-on (I will probably really do this one)... because it will be great to stay there when we have invitations to Club 33. Do you see the pattern?
OTOH: If there was a vibrant and active "home swap exchange" program going on... I could state ~ 13 months in advance: Planning a 1BR BWV for F&W 2009... but looking to exchange for BCV. It would be ideal if we found someone who is going the same general time frame .. or even better the exact same timeframe (because there is much less risk)... and we could both book at the 11 month window. I would think that someone who goes to their same resort year after year... may be interested in an exchange just to try a new resort... without the hassle of day-by-day booking at 7 months... with the risk to switch nights mid-stay. Plus, if the reservation dates were identical... you could always check into your own unit if things got out of control.
This is just my humble opinion... but you asked
/Jim