it would be best for them to keep Modern Warfare, Call of Duty and some futuristic warfare game as a separate titles that would be released every 3 years - Modern Warfare in 2009, next Call of Duty in 2010 and futuristic war game in 2011 and then Modern Warfare 3 in 2012. this would keep those series relatively fresh, would give developers enough time to develop really good games and wouldn't tire the audience that fast.
Guitar Hero series is pretty much lost - activision should only release World Tour and 5 and those band specific games should end up only as a DLC.







