Yeah, but they're shrinking (in physical size) as it is...digital allows for that, digital encourages that, digital damn near mandates that, eventually.
So if all I'm getting is a needledrop or a digital xerox of somebody else's work...I don't feel much need to have a "physical copy" of that, especially not one that I pay for. Not now.
If, otoh, I can get value added to something I want by there being original, improved remastering, original detailed annotation, somthing that's not just a copy of a copy, then I got no problem springing for that. As I long as I have disposable income, it will be disposed!
We have options as end-users (note that I didn't say "consumers") now that we didn't have in the past. I think it behooves us to exercise them in the interest of raising the bar, not lowering it.