Not really surprising is it? I mean you didn't need to change TVs when you upgraded from VHS to DVD. Plus there were a multitude of good reasons to change to DVD such as:
* playback quality being the same nomatter how many times you watch
* surround sound
* picking subtitles or different languages
* being able to skip to a specific chapter
* all those DVD extras like deleted scenes etc.
Blu-Ray just gives us more capacity and better picture quality than DVD providing you've shelled out for an HD TV in the first place, but no compelling features that make using it more enjoyable. The only feature I'm interested in is Blu-Ray's more durable disks. Not enough to make me rush out and get one mind ..