To allow the series the chance to flourish in a new era, it's time for Call of Duty to abandon the annual release cycle.
Never going to happen same way as FIFA for example. It just sells way to much. Also I also think they have 2 or 3 different studios helps with releasing a new title each year.
As you said multiple studios. Infinity Ward, Treyarch and Sledgehammer each develop one game every three years in turn to keep us drip fed
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