One thing I was thinking recently is that if we get sufficiently good at humanoid robots, perhaps it will be within reach to build a robot around a human that can put arbitrary pressure on different parts of the body sufficient to create the feeling of soccer, jujitsu, or even sex. This is probably a 10-100x harder robot to make than a humanoid robot. But it seems more straightforward than a HBI capable of full VR.
I find current HMDs strapped to my head very uncomfortable, and that they're a major hurdle for mass VR adoption. In general, people want to be _less_ physically absorbed by technology, not more. I can't imagine anyone would want to use an exoskeleton robot suit for increased VR immersion. If anything, you would be less immersed because of the suit itself.
I think this level of physical immersion is not feasible. It's likely that we'll prefer brain-computer interfaces instead, and the stimulation would be done directly on our nervous system.
You can't physically stimulate inner-ear response without actually accelerating and moving. You'd need to find some way to mask those signals so you actually feel like you're moving. Would also be the only way I could use VR due to awful motion sickness.
