Call of duty 4 is popular on all of its patches. Here is some proof, it doesn't show the full 100% who plays it but it shows a decent amount of who play it.
http://www.xfire.com/games/cod4/Call...odern_Warfare/
The link says they're 140,040 people on a day. Is 140,040 people online a day dead?
Edit: Were did you read this was dead online? Sounds like someone was bashing on call of duty 4
Sincerely,
Zealex