Botnet rental: $3.
DDoS'ing your credit card company: Priceless.
There's some things money can't buy.
If the next Modern Warfare introduced dramatically different themes, there would be uproar. Sure, set it on the moon, but make sure I’m a grunt following the NPCs who get to play the game, or I’ll swear at you on the internet.
Then perhaps it shouldn't be another damn Modern Warfare game. How about--gasp--a brand new game. I get that not making sequels each year requires creativity and risk, but think of the reward.
They won't do it. Not as long as Call of Duty can rake in billions of dollars a year for a sequel that is almost identical to its predecessor. Hell, they haven't had a new engine for the entire series, they just keep tinkering with the old modified id tech 3 engine. It would take having the CoD series flop massively to get Activision to actually look at new IPs. They ran all of their other major IPs into the ground, why would they break from standard operating procedures now?
The hardest part of climbing the ladder of success is getting through the crowd at the bottom.