How does that fact that there is space war defeat all the arguments against 3D films? Namely, the fact that no one has ever had any problem determining depth from a "2D" projection, because parallax is not the primary source of depth perception in humans.

There are plenty of movies and television shows in 2D that feature air and space battles, and never once have I found myself thinking "Gee, I really wish I knew which of those objects was closer to me."