Yes. If their vision is to eradicate physical media, then they're going to have to provide a solution for the used game/movie market.
I don't believe they will have to. Digital consumption has already spread to many markets and has become successful if not the standard. When you buy a digital MP3 or Album from Amazon or iTunes, can you resell it?
The "scary" thing about this becoming the standard on consoles is it leaves the publishers and/or console manufacturer's with full control over our purchased goods. It is very likely that both the new Xbox and the PS4 (already confirmed) will not support backwards compatibility, thus making your entire digital collection you've accumulated unplayable going forward. Does that mean Sony is going to make us pay for a premium subscription for the Gaikai services? Or perhaps charge us again for the PS1/PS2/PS3 games we already own? These last two statements are just speculation however.
The other issue, on PC, you can often get significant discounts on digital games either via Steam sales, Green Man Gaming offers, etc. If consoles do not follow a similar pricing system, there will be no advantage gained.
All digital distributors also suffer from distrust. You have to have some level of trust in said company that in 5, 10, or even 20 years from now they will still be around and you'll have your digital content on that account. I know at the very least that Valve has commented if they were to ever go out of business, they'd pull some "switch" to allow its users to access and acquire their accumulative library of games.