Why do you think a majority of people with SO would be better off enrolling with Abound
1) There's a lot more options within Abound.
2) There will be a consolidation of fees (it's possible they do this within VSN, but I think they'd like everyone to move to Abound, so I'm not certain this will happen).
3) Many of the "aspirational" type properties (Ka'anapali, etc) are better off in Abound because they get higher point values than some of the nice, but less aspirational properties (like Kierland). There is an incentive to use the new product.
4) With less availability of the premier VSN properties, it makes more sense for owners of some the other properties to join Abound as well (because of point #1)
So if someone owned at WKORV and really liked Kierland for the occasional trade, they could go and stay in a 2 bedroom for almost 2 weeks rather than the 1 week using the VSN. Because of this, I see the inventory at places like Ka'anapali, WSJ, and Westin Riverfront drying up, therefore most people would be better off with Abound.
I like VSN. Unfortunately for me, I only recently got into it. Having such good access to a lot of great options is remarkable. However, ultimately I think that Abound will be a more attractive product for the majority of owners. Because of that, I think I'll be better off enrolling into Abound.
Sales drives everything and a more attractive product is much easier to sell.
While many Tuggers will feel the impact as the VSN gradually becomes a shell of it's former self (as availability at most properties dries up) as Abound becomes more attractive, I think ultimately the vast majority of owners will be happier within the combined system.
Ultimately, I think Marriott makes the VSN less attractive by virtue of creating a better product for most owners within Abound. Those of us who have seen and taken advantage of the arbitrage opportunities within VSN may be worse off, but at least we'll have more opportunities of places to to trade into with our usage.