I've had a couple home bluray units go bad on me, and they just sit on a shelf. The track pitch on HD DVD's is so tiny that vibration is a huge issue. Any hard mounted unit probably wouldn't last long. That's not to say that a shock mounting system couldn't be invented, but that adds cost and who will do the engineering and shock & vibration testing. And most of all, who will take responsibility for warranty replacements for the inevitable returns. I plan to get a small Blu Ray player soon, but during traveling I will wrap it in a few towels to keep it isolated.