The only reason I put any weight into what the DVC guide had to say, is that he admitted that he didn't know much. But he did say that the hotels were definitely coming and also said that he would be surprised if any future new hotels didn't include some kind of DVC component. The point that he made was this....Riviera is going in front of Caribbean Beach. He said it was very possible that the lobby to CB will be inside of the Riviera, so it will be one big advertisement for DVC. People that love EPCOT will also be tempted to explore a hotel with up front access to it and will also be a good reason to think about DVC.
On another note, he also mentioned that due to the popularity of the new Star Wars hotel, he believed that there would only be limited stays such as 3 or 4 days allowed. I guess we will have to wait and see, but I suppose that Disney wants to expand and stay ahead of Universal.