We will have to see. The strength of the Xbox brand in the US is still very strong, especially with the 360 still dominating over there. That said, it's not impossible. Both MS and Sony played all their card tonight, and Sony certainly came out far ahead.
MS played most of their cards. they announced 13 exclusives from their 15, titan fall probably isnt one of the 15 they talked about though. sony announced first party 20 exclusives to come in the first year, 30 in development. they have knack, drive club, KZ, infamous and the order announced. meaning they have shit load of games still unannounced. sony has a lot more cards to play. the only reason people are saying they "won" is bacuase the price and no DRM