I'm curious what they'll end up with. At face value the idea combined the ability to lend physical media with the convenience of purely digital data. They're practically creating a distribution network with that sort of model. But would anyone want to pay Microsoft for the "privilege" of sharing their games? Even then, if it's low enough it'd still offset the cost of buying a game entirely. How crippled would the feature have to be to offset that convenience and cost, and still have it be something people are interested in using.