I'm not saying that the official name will change, just popular usage. I'm trying to imagine Mom (or really anyone) saying to me, "I'm going to the Blockbuster to rent a BluRay disc," the same way she might say, "I'm going to the Blockbuster to rent a DVD."

Maybe the change will just be in avoiding referring to them directly — "I'm going to the Blockbuster to rent a movie" — only using the term BluRay when distinguishing it from a different format. I wouldn't be surprised if people just kept calling them DVDs otherwise.

I guess what I'm getting at is that I believe that the term BluRay will not become part of commonplace parlance in the way that DVD has.