I wouldn't overestimate this... we'll probably see a neck to neck competition over the ps4 and xbox one especially with MS behind the scenes back peddling with their policies... I'd also assume that a small amount of people would buy the xbox one without looking at the competition even with the competitions lowered price since the xbox has created a namesake/community in the U.S and unlike the PS2 majority transferring to the ps3/360 era there are two advantages MS has:
1. being able to have a online subscribed community of die hard shooter fanatics (particularly some of the COD crowd)
2. Not suffering a late launch where their main competitor can be in the market for a whole year