I think some people are just so susceptible to motion sickness that they will never be able to enjoy it. Contrary to your experience, minutes after setting up my Vive for the first time I was comfortable floating around with true 6 DOF for my simulated character, with near zero quease.

I don't think there is any sort of "advances" that can prevent some people from being uncomfortable with "virtual" motion. It is unnatural and that's not going to change.