There are a number of reasons how an OoT sequel (sans MM) I believe would work:
- Once again, at the end of Ocarina of Time as well as Majora's Mask, we have been left with a cliffhanger ending.
- We've only established that Link is a wanderer for the most part – what if he does find Navi at the cost of something relatively important, like say, the Kokiri Forest.
- The possibility that we could be shown the death of Hero of Time.
- Obviously it would generate money for Nintendo, y'know from all the changes that Skyward Sword is doing and the fact that it would be a direct sequel to OoT/MM.
- Testing out the Wii U, not so much a tech demo as Ocarina of Time 3D was, but testing the content limit.