The whole "ten year plan" thing is already 5 years underway...
Bungie signed a 10 year contract with Activision to develop Destiny in 2010. However I'm sure they'll keep making the game as long as we keep buying it
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Bungie left Microsoft because they wanted to work on other games. Microsoft just wanted them to keep making Halo. Halo was still selling though. Sometimes developers have other visions.