Once they figure out how to steady the stream of air then it will look perfect. Biggest problem is that because it is used by air I imagine that everyone has to be perfectly still, no fans, ect. The problem only amplifies when you get up to bigger displays. They could put up panels of glass all around to steady the stream and stop other air flow from disrupting the picture.
Doesn't this remind you guys of doom, you get up close to the guy and hes 2-d or in Duke Nukem 3D you go around plants and shit and they are flat.