In my opinion, it is dying.
Treyarch hold the end of the stick to revive the series, they break it, and that's it for me.

Sells were at the highest for MW3 because MW2 was the best and people had high hopes for the series but people were SO disappointed by it, future game sales weren't as high.

MW3 was hands down the worst CoD game ever made and Ghosts was right next to it.

Call of Duty Games From Best to Worst:
*Modern Warfare 2
*Black Ops 2
*CoD 4: Modern Warfare
*Black Ops
*Advanced Warfare
*World At War
*Ghosts
*Modern Warfare 3

NOTE: From MW2 to W@W were all close in greatness, the dramatic suckage is at Ghosts; it's like going from an 8/10 to a 4/10.

In my opinion yes I didn't by advanced warfare and I don't plan doing so Treyarch has the torch and if they **** this one up that flame will burn out.

Same man I don't know why but I prefer the old cods too, maybe cause they were just plain and simple back then.