DualDisc rocks IMHO. It allows fans to spend a few bucks more to get a release they can listen to "now" on their CD players AND in their normal DVD-Video players and still invest in a technology they feel they are likely to get down the road. Also it's something you can't get by mearly downloading the CD online.
I would think with universal SACD/DVD-A players getting so cheap now, which format an aritst releases a title in means little to the newer consumer (I do sympathize for the early adopters though). I also think that once universal HD-DVD/BluRay players get common and cheap, the format war will end like it did with SACD/DVD-A : in a draw.
People always bring up VHS vs. Beta, but you couldn't get a universal player for those formats back in the day. Same with MiniDisc vs. DCC or whatever that other format was.
Remember when there was going to be a "standard" war between 720p and 1080i? Enough TVs came out that could play both so it didn't matter. But, like you early SACD or DVD-A adopters, I got screwed because my TV only plays 1080i.