I'm not in the game development field so I could be off base, but I assume they take a sustantial amount of time every year to polish the game and get it ready (bug fixes, etc) for release. Additionally after release they have to spend time doing patches. Most of what gets patched will probably end up in the next game anyway, but it seems more effecient to do it every other year and only have one polishing/beta testing/patching cycle every two years. They can keep making money on the game with fighter DLC in the mean time, and possibly other DLC routes like PPV events with specialized commentary (just for example.)
Also, from a project planning perspective if you have an idea that is going to take two years to implement an annual release schedule means you have to get it to a releasable point in one year and then finish it the next one, so you end up with half-baked features all the time.

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