User blog comment:Crazy sam10/Infinity Ward explains leaving Modern Warfare series/@comment-81.99.27.82-20130531122846/@comment-1187559-20130605091451

"Here's the question, what harm would open level design pose? Absolutely none." - Wrong, wrong, wrong and more wrong.

It would completely change the gameplay style of the game, and when you change something as fundamental as that you're changing the entire prospect of the game. If a company went to Activision and said "We want to make CoD, but make it completely differently to the already established core elements" Acti would just say no. The Game Industry plays it extremely safe, getting a new game that isn't currently the norm past a publisher is extremely hard, especially if you try telling them you want to change a core dynamic that is working perfectly fine.