Seriously. What Sony should have done is make DVD's that would be read like a DVD on a DVD player, but read like a Blu-Ray disc on a Blu-Ray player. They had the technology years ago, but never did anything with it. Instead companies went with dumb double-sided discs or packaged a DVD with a Blu-Ray disc.
If Sony had just sold all their DVD's with a Blu-Ray layer for a couple of years, then they could just tell customers that they can take advantage of the movies they already own when selling the Blu-Ray players.
“Seriously. What Sony should have done is make DVD’s that would be read like a DVD on a DVD player, but read like a Blu-Ray disc on a Blu-Ray player. They had the technology years ago, but never did anything with it. Instead companies went with dumb double-sided discs or packaged a DVD with a Blu-Ray disc.”
BD has a different structure than DVD. You cannot combine BD and DVD. HD DVD had the option of putting DVD and HD layers on the same side of the disc but the option was not really utilized by the studios.