People saying "Nothing" are either weird ideologues or are not being honest.
In this thread you can make up your own hypothetical scenario where Microsoft funds exclusive sequels to your 3 favorite third-party games of all time. Or makes the dream game that you have always wanted, but never seemed commercially feasible. Or creates a cross-buy program with the PC. Or purchases your favorite developer. Or announces a full-body VR suit. None of those things would be enough to buy an XB1? Nothing would be enough?
Look, I understand the indignation over restricted used game sales and requiring internet connections for single player. I'm glad the community pushed back. But ultimately there comes a point where content trumps politics for me. The content is why I am in this hobby to begin with. If Microsoft shows off this generation's equivalent of Mario 64, they could put ten Kinects in the box, change all the system icons to NFL team logos, and  replace the boot up screen with a personal insult directed at my mother, and I would still be lining up for it.