Virtual reality FPS games on Next gen systems

[gumby_trucker]

from the looks of it the real challenge that has yet to be solved is proper integration of the user of such a system with his surrounding environment. Maybe the display could be made partially transparent to prevent such accidents as bumping into walls (or each-other)?
Better yet would be if the system came with real world collision sensors that fed data in real time back into the logic rendering the game's level. That way a virtual obstacle could be rendered in place of a real one, to the benefit of both safety as well as immersion. This would of course place constraints on the types of virtual environments at your disposal in any given moment, but it's a step in the right direction...