Great in theory but it's either going to be upscaled jank with '4k' meaning games with the graphics fidelity of wolf3d running in 4k or instead it will cost £1000+ and no-one will buy it.
When it comes to VR you should really buy a PC, in the whole console/pc debate the argument has always been I don't want to spend a ton of money on a massive beast of a PC to play games. Well if you want VR, you're going to have to.