I'm not in the bluray camp, but i think there is a clear difference between DVD and blu. The "problem" (if you really call it a problem) is that as the person above said, a lot of people don't give a damn. Bluray's chief selling point is a better picture and the chance for more content. Your problem? A lot of people really can't be bothered whether the picture is better and a lot of people that don't give a damn about the added content.
So that brings us to where we are today, instead of the new content slowly wiping the latter into the antique market, you've got two dual successful markets. Where one side is filled with people not wooed to convert and the other is filled with people who have converted and baffled others have not.
There's really not much more arguing to do on the subject. If you weren't wooed to switch over to bluray with 2013 about 3/4 of the way done, i'm not sure how many still are. If anything i bet both DVD and Blu will lose more digital downloads then they will to each other as we move forward.