I had thought that DVC had a 5 year contract with II and they renewed for the second 5 years. There have been postings stating that people's DVC Sales Guides have said the RCI contract was 1 year, 2 years and 10 years. However, according to the
press release on Dec 2, '08, the RCI-DVC contract is a "multi-year" relationship and RCI is currently DVC's "exclusive third party exchange provider." So, anything less than two years would not honor their contract. Honestly, even two years is not much time to evaluate how well it's going with members.
RCI was DVC's first exchange company and they later switched to II. Changing the exclusive provider is not that easy. I suspect members were not all that happy with the limited options they had through II, particularly since the most popular ones gave preference to their internal traders and rarely had primetime available for DVCers and other II members.