I've got one of these VR visors;
http://www.tomtop.com/virtual-reality-headset-1337/p-v2229us.html?currency=GBP&lang=en&aid=gplagb&gclid=Cj0KEQiAhNnCBRCqkP6bvOjz_IwBEiQAMn_TMV9NvSzfgJLqtfw6Cm4Va-LDjGq9Ziq_jFhiEW5qL2saArzt8P8HAQ
It's only a 70hz refresh rate and the sensors are built in. Tracks my movement nicely. Hardly a powerhouse either. Its a octacore android device but the cpu's are lower end 32bit arm chips not the much more capable 64bit arms of the Switch. Just a chinese manufacturer with minimal R&D investment. If they can make it work well I see no reason why Nintendo can't do a better job of it.
Even at 720p there is clever stuff you can do with the lenses to focus more detail at the centre and even do a slight under focus to prevent the screen door effect. However I still suspect the Switch will have a resolution above 720p for the tablet. Not necessarily 1080p it could be an inbetween resolution, 1400x900 approx.
Whatever absolutely no reason the Switch can't deliver a fantastic VR experience with the only sacrifice being resolution.
