They need to chill. They make them way to fast. If they just wait like a year or two then people will really want it and they will buy more.
WaW was made by Treyarch. Thats why WaW failed so much. There not putting it out to fast, they probably started a couple of months after MW 1. (Treyarch also made COD:3, so they made the 2 worst games in the entire series.)