I think 2 sensors could work. Although there'd be quite a bit of latency as your mouse processes/calculates where it is and then sends the proper signal for your cursor to move there. But of course, it would never be as accurate as a tablet puck thing because we don't even have completely perfect sensors. Use any "perfect sensor" mouse for a long enough time and eventually you'll find it was perfect enough (and obviously for this to be the sensor and not human error you'd have to get a robot to move the mouse purely by translating and not rotating). Also the mouse would have to keep track of where you are and there'd have to be a starting position and you'd have to never lift the mouse. Why? Because if your mouse wasn't in a starting position how would your mouse know which direction you're going when both sensors detect you moving up?
Anyway, that's just my guess but I don't think any company will ever make such a mouse and I probably didn't think of the loads of other problems that would be encountered with such a mouse.
Anyway, that's just my guess but I don't think any company will ever make such a mouse and I probably didn't think of the loads of other problems that would be encountered with such a mouse.