The great relative success of SACD for the music companies is that nobody can rip the HiRes sound tracks.
I think the best strategy for the Film and Music Majors is the following:
- Let the HD-DVD be for the computers industry HD storage of choice to replace the DVD
- Leave the Bluray for recorded business.

This way the content is naturally protected nobody can rip something that cannot be played on the PC. Simple and effective.

I'm no one to advise them but clearly that's the only safe route against piracy, everybody will have exclusive rights for a specific industry. Should make everyone happy if not they deserve to fail. I will keep my G91, and wait for they downfall.