Wyndham is doing that now - they've restricted certain weekends/holiday dates and other highly desirable dates at their most desired resorts (such as Club Wyndham Bonnet Creek, down the road from RIV) to "owners only," and owners are allowed only 2 reservations a year that don't have their names on them, unless those reservations overlap with a reservation that does have the owner's name on them. Unfortunately, there have been multiple reports on the Timeshare Users Group of Wyndham's canceling reservations that shouldn't have been cancelled, at short notice, and owners' guests having been left without a place to stay. I'm not sure any of us would want to trust
DVC's software to do better.