Wasn't the main reason to own a 360 last gen was the Halo series and better multiplats? Well, we all know who's getting the better multiplats this gen (hint: PS4). Halo has been by far MS's most successful exclusive, but is it enough to make the X1 truly succesful? The original Xbox had Halo & Halo 2 yet still couldn't come close to PS2.
Bonus Question: Could Wii U become 2nd place as a result? It has very strong exclusives that people seem to be still interested in AND it's much cheaper.