Starting today, "members who do not purchase an ownership interest directly from Disney Vacation Development Inc. will not have access to Membership Extras," the company says on its website.
The change only applies to new owners starting today. Current owners are grandfathered in.
The only drawback to this is that current DVC owners will not be able to draw higher prices if they wish to sell their DVC ownerships. It makes it less attractive to buy DVC points with anyone else other than Disney.