its a funny way to produce fact, isn't it? what study shows what you said are "facts"
You don't need a study to declare those factsit's just common sense. Look at it this way:
What problems with current UIs would be solved by putting them into 3D space? We don't have any really good ways to interact with a 3D windowing environmentour mice operate two-dimensionally, as do our displays. Obviously 3D games are trying to imitate life, for the purpose of entertainment, so there 3D makes sense. But in a general OS interface, the point is to help arrange tasks and information, and most of the tricks and shortcuts we use to make these tasks more efficient in computers are hampered by tying them to real world metaphors. Would browsing a virtual 3D store somehow be more efficient than viewing Amazon webpages?
The only 3D desktops I've seen are Looking Glass (which uses 3D as eye candy) and Beryl/Compiz (same thing). Neither of them are fundamentally different from a 2D UI, they just use 3D elements to "dress it up," usually in ways that are either unintuitive or just silly. That's not progress. It doesn't accomplish anything useful. Even 3D virtual reality interfaces that have been toyed with in the past are impediments to usability.
Here's my question to you: how do you envision your so-called 3D interface? What problems are you trying to solve? How would it behave? Or are you just envisioning "more eye-candy?"