It kind of assumes that Blu-Ray will actually have a time and won’t be bypassed by whatever comes next. The interest in DVD was more about the compactness and the disc format and the fact that it didn’t degrade in quality over time, I think, than anything else. A lot of people went in and bought big DVD libraries based on those factors that they won’t want to go and re-buy (and this was a significant factor in DVD’s success – sales of the back library), and now we’re heading into difficult economic times.
I think BluRay may become a bit like LaserDisc…