When are we going to be able to get digital copies of games? The technology has to be there and ways to write these digital copies to a usb drive or hard drive while still protecting piracy! CDs are a dying technology I think and not one for kids games, Either that or better protective coatings on the CDs so they last longer than 3 months, even looking after them as best as possible.
I know how important this is for you and believe me, I do get your point and personally, I think this is a great idea. But here's the thing, there is already a digital version. As for your concern with the disc replacement, it's kind of how most replacement goes. I mean, I'm not really good with metaphors and such, but anyways, you purchased for the disc which is, and is a different version compared to a digital version which is a separate kind of product from a different retailer/channel. All in all, you would need the disc. Also, that's how the policy that Activision gives out for disc replacement. Here's a link for more details: http://support.activision.com/articles/en_US/FAQ/Download-Disc-Replacement-Form/