The Fury on 10 February 2017
Regardless of if they go back to their roots, in gameplay or setting. I think the last few CoDs (even though Black Ops 3 was a great game in my opinion, just ruined with stupid extra guns and melle weapons in the boxes), haven't helped to what people want in the series and many gamers have already left and won't be coming back.
I'm pretty sure, all Dice have to do is announce the next Battlefield game will be Battlefield 1944 and it'll take over from CoD's millions.
Hmm, pie.
