We've had problems w/rooms, the dining plan, MS getting reservations wrong, etc. We've also had amazing experiences. I don't think this type of disappointment will cause me to sell.
We traveled alot before
DVC, and we will continue to travel either by using DVC (or not). Booking problems, reservation problems, miscommunications happen in any travel circumstance. 2 years ago British Airways took my money, booked me an "itinerary" but never ISSUED me a ticket. I found out while I was at the Paris airport w/o a seat. Yay! Point is, mishaps w/travel is to be expected. It's silly to think that just b/c it's Disney, it won't happen.
I avoid reading threads where people say they're going to sell.
My thought is, then sell, b/c I don't feel like standing behind that same person in line at the resort waiting for them to finish complaining to the front desk person about stupid crap and screaming that they're a DVC owner (how embarassing)!
Hopefully I will always be able to afford the MFs to keep my DVC contracts.