VR/AR could be great for general emulation once it gets a decent screen resolution. Consider that you could just make a bunch of really cheap 3D printed controllers that perfectly fit the dimensions of actual hardware/controllers, and it would allow emulation of hardware gimmicks like the dual-screen of the DS, wagglin sticks of the Wii, second screen of the WiiU, and even allow you to use light-guns with light-gun games.