Thought this was interesting enough to post here.
I think if you have the cash and need then physically bumping people around is best, and having a ‘cave’ (maybe with 3d polarized glasses even) is nicer than current VR.
That said, a bit way off in the future but stuff like galvanic vestibular stimulation (one for the swearbox filter) is interesting in that there are a few promising ways of being able to create a sensation of falling (or not falling) directly in the inner ear via small electrical pulses. This could help out with a VR/AR type case, in that you will really feel inverted or falling. People are for some odd reason a bit skittish about direct electrical inputs on their skin, but it could be the way to go. It’s also an interesting way to combat current motion sickness with VR.