While I think some games could work well for motion controls, even up to something like Zone of Enders, I don't think Ninja Gaiden would work well. Part of the reason the game is so good is because it uses precise button combination like a 3D fighter, but in a 3D action game environment.
If you altered that to focus on motion controls, the entire structure of gameplay would have to be changed as the interface is now changed. And in my personal opinion, you wouldn't have the ability to have a game focused on combos and intense timing focusing on motion based controls, much like you couldn't have a fighter focusing on motion based controls.











