If you want to see more on the screen at any one time than your current 4k screen it's going to require more pixels no matter how you arrange everything else. If you want to put it 'deeper' into the VR world than just placing the exact same screen data onto the VR screens will require multiple real pixels per fake VR screen pixels.

Also don't forget you have to have 2x panels with the increased resolution at smaller sizes than the existing monitors.

Finally if you are just scrolling through a virtual screen there's no reason that can't be done on today's monitors and we already have eye tracking tech available without having to jam that tracking into already crowded glasses.