Eh, it's still in the palm-pilot phase. They'll figure it out quietly over the next 10 years. Machine learning will help figure out what to pull into the headset (things you're about to walk into) or it will intelligently make the game world similar enough in your immediate surroundings to where you don't hit stuff. I could see people hanging out at parks or beaches with these things on. Even going for a swim if the headset is waterproof enough. It will just take decades of work to get there.