Earlier quoted context omitted.
There are pills you can take against motion sickness, it is a known problem that some people get motion sick easier and throw up from situations normal people handle just fine.
I disagree with your categorization that 20-80% of users who experience motion sickness are not normal. In fact, it would appear that people that actually like VR are in the abnormal category. Now we gotta take anti nausea drugs just to play games? Is that reasonable? I don’t think so.
For what it's worth, I don't think this is unique to VR...I used to be a big FPS player back in the day (Quake 1-3 mostly), and I had a friend that got motion sick playing Quake 3, so he couldn't play in our matches. It's certainly the case that I've heard more reports of motion sickness in VR, though.