That is a pretty bad article about VR that might have been excusable in 2013 but is not on firm ground in 2017 much less 2018.
Broadly, almost everything in it has been either not born out (vision concerns) or less of a problem then first assumed (motion sickness) once the limitations of different users were understood.
Many people using VR find that the vestibular concerns are not an issue over time as long as the framerate of the system is high enough (90fps+). People actually do get their "sea legs" over time and many (largely gamers so far) ask for locomotion systems that were considered terrible ideas even 2 years ago.
Broadly, almost everything in it has been either not born out (vision concerns) or less of a problem then first assumed (motion sickness) once the limitations of different users were understood.
Many people using VR find that the vestibular concerns are not an issue over time as long as the framerate of the system is high enough (90fps+). People actually do get their "sea legs" over time and many (largely gamers so far) ask for locomotion systems that were considered terrible ideas even 2 years ago.