Sure it's a great idea, but the studios will never see it like that. They'll see it as, "Hey, we can charge $5 more for this movie! Those sucker's'll never notice. Morons."
It's been done. And they charged more for it. Dualdisc, anyone?
We can always hope, but sadly I know it is true, Disney looks to be charging a bit of a premium for thier movies right now and I would guess it is due to the dual disc issue . then again a premium for Disney discs is nothing new.