Honestly, I think it largely comes down to Microsoft still being a bit greedy/nervous of digital distribution. Had they first announced "we're going to let you trade-in your digital games to us, you'll be able to rent digital games from us and wait, there's more... digital copies of AAA titles will now be $10 cheaper than physical copies" along side when they first announced the DRM, everyone would have said "yay Microsoft for being ahead of the curve". Instead, MS is trying to have their cake and eat it too... they're trying to be the RIAA of video games and want to take away capabilities while not giving the user very much added benefit.

All of that tacked onto the $100 more and the required Kinect just made folks leery of buying the XBox One.