If you read the comments, quite a bit further down, a colleague (Rowley) pipes up with this:

The data that put a bullet into Segas plans came from a study they commissioned to be done by SRI. Very few ever got to see those results since I don't believe Sega ever released them. But some of us got to be privy to the findings.

In brief there was a small percentage of folks who retained depth perception issues for periods of time ranging from 15 minutes to a couple of hours. SRI determined that a small percentage of that group could suffer permanent loss of depth percentage. The potential liability issues were staggering and the plan to put headmounts on the worlds game playing kids was killed - kaput!.

This seems believable, and SRI is a reputable company.