Now that is really an interesting question.
I wonder if blinking with one eye would be disruptive to the sterovision that is going on. An interesting test would be to train oneself to blink one eye at a time.
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I think you answered yourself: stereovision support. The mental context-switch needed to go from stereo to mono to stereo again is probably more expensive than just going from stereo to nothing and back to stereo. I just tried it and closing one eye at a time made me sorta dizy.
(disclaimer: not a trained eyetician ;-)