I have an idea for people like me who don't have a very fast internet connection and want some games in their digital versions :
Let's say one of your friends have a retail version of Dead Rising 3, he or she lends you the game, you install it on your hard drive, then you go to the Games store and purchase the digital version of the same game. Instead of downloading the whole game, it just downloads an activation file and you don't need to go through a 35Gb download. Take the disc off of the drive and enjoy a fully digital game with no download required :)
What do you think ?