I'm sorry, but you don't know what you are talking about. I recorded the video/gif you referenced in your first post. While my one friend did slam into a wall, she only did so because she ran. If you walk the system will stop you from crossing the play space boundaries (pass-through camera and virtual walls), and in the many, many demos I've given in the space you see up there in the video, not a single person has had any problems. And in case you hadn't noticed, VR is already a consumer product.