COD: Aerosmith
If 1 a year is good, 2 or 3 is better right? Unless they learned their lesson, I wouldn't be surprised if it happens.
I see this comparison often.
Here is the thing: Guitar Hero (and etc) was really kind of fucking boring. That was a fad in every sense of the word. It is the same old rhythm game painted over with a gimmicky way to input commands (which unlike DDR didn't really give much physical satisfaction) and the fact it has so many songs to play to which people might actually like in America (much unlike the Konami rhythm games of the past). Took up a bunch of space too.
Call of Duty is not a dressed up version of simon says. It is not coasting on the appeal of a tracklist. Comparing what a multiplayer (or even single player) game of Call of Duty does to the brain compared to Guitar Hero should make the difference clear. Though it may not be the best FPS, it is the most accessible and known form of that and the FPS isn't going away. CoD will need to be dethroned (I actually think the market will be evened out more over 2-4 games, e.g. CoD, Battlefield, etc).