Nausea issue is not solvable by any standalone device. We'll either have direct brain jack-in that can override full range of sensory input (so there will be no dissonance between your sense of balance and vision) or we're stuck with mostly static experiences (teleporting point-to-point instead of moving etc.) which are not immersive.
Not seeing the first one delivered within 5 years for sure and probably not within 50.
Not seeing the first one delivered within 5 years for sure and probably not within 50.