You said they "will never be able to use vr" when all there is that they felt some degree of motion sickness in some situations. Might have been poorly developed games (the industry is still learning how to avoid motion sickness), might have been multi-hour sessions, might have been in combination with drugs or other sicknesses, might have been totally mild symptoms after all.
VR may not be for everybody, but it's not that everybody who says he experienced motion sickness once will never touch VR again.