Yeah, the main reason for my comment about DVD-RAM is the lack of acceptance, compatibility....it is like the old Betamax (vs. VHS). But there are many examples of this....8-Track tapes, Vinyl LP's, old 78 Vinyl records, laser disc vs. DVD.
Don't get me wrong, there are times I only want to listen to some of my old vinyl LP's on my Technics turntable....and feel that the K-Mart'ish attempt at digitalizing that wonderful & rich analog sound is sonically sinful.
As Blu-Ray technology develops, they are looking to develop backward reading (?writing?) compatibility with DVD/CD media, but once you see HDTV, and see the larger storage and quality recording capability, it will be similar in comparison of DVD vs. CD
Remember the main breakthrough of that technology is the shorter wavelength. When you read those two links I posted, you see the obvious benefits in quality. That's why it is a winning technology...it's benefits are radically better than compared to the minor difference between DVD-RAM vs DVD-/+ R/RW
The reason DVD-RAM will not be supported in the long run is the music and movie studios, and general public do not embrace it. Nothing against the Japanese/Pacific Rim countries, but I do not regard the Japanese market as a good barometer of widespread success of any particular technology.
Having the +/- R controversy is where the "VHS/BETA" wars are raging....there is just not enough improvement with DVD-RAM to have the public bother with yet another format war....Blu-Ray is different. It will be similar to DVD vs. CD which was obviously needed.
Are CD's obsolete? No....but do I like having a DVD that can put a movie on one disc in a higher quality format than trying to put it on a compressed format on several CD's? Of course.
Are there many 2-layer movies that will not completely fit on one DVD-/+ R/RW disc? Of course. Would I like a new media that would finally fit them on one? Of course. If Blu-Ray was ready, and affordable now I would buy it in a heartbeat.