Whether this is a serious issue or not, time will tell.
So I guess the moral of the story then is to combine the 3D technology with a projection system that puts the image at close to infinity (like http://www.mikesflightdeck.com/Scenery_display_2.htm).
I've played around with this lens approach for flight simulators, and I have to say that having the image near optical infinity makes a much larger impression than you might think. You are actually looking through the screen, not at it. The quality isn't great, but it greatly adds to the feeling of immersion. I think this is more important than 3D, since stereoscopic vision really only works at quite short distances.
Those actually physically have the light reflect to your eye from different positions in the "z" direction.
They seem to have a number of techical problems though that would prevent them from being ubiquitous.