That short term use doesn't even touch the physiological impact of extended use, hours per day, days per week, weeks per year and of course years, as the likely very poor outcomes that would result. Most people don't even being to realise how tiring and painful it is to continuously bob and weave you head about for hours on end. It really does put paid to the idea of sitting back at the end of the day and gaming, phsyically not possible with VR unless you turn off motion detection and rely on hand controllers to do it instead and just use the VR display for immersion.
It would make serious sense to produce base model immersion on VR displays, with no motion detection or anything else, just a plug in immersive 3D display, this for people who dislike the experience and motion sickness, people not interested in spending that kind of money (double plus saving, greater unit production significantly reduces cost per unit, this driven by a much cheaper unit generating the bulk of sales, especially if it manages a USB connection and the appropriate Android or Apple software) and people who just want to sit back or even lie back (possible to lie down in a comfortable bed gaming with no motion control VR). It would be silly to release just the high priced version without mentioning the impending future release of a budget 3D immersion version and appropriate controllers with smart phone connection and software.