I'm not colour blind... but, (and correct me anyone who is colour blind) I'd say that 3d movie's are still visible, as the colour is there, just not in place that those without colour blindness would view it (eg. blue swapped with red, green with yellow, etc)
Also, colour tones between black and white are what give depth to an object. Colour blindness does not affect the "rods" (a receptor in the eyes) that pick up on this.
On a final note, it's the goggles that determine whether or not the image is viewable in 3d, and if you observe the colours on the lens of some more simpler 3d glasses, one is red, the other blue, which going back on the "red=blue" and vice-versa, there would not be an affect anyway.
(there's probably errors in my thesis, feel free to correct me if you can)
