Oculus Store could host some optimised 2D games, that could be played on a virtual monitor!
Playing some 2D games in VR could be something very cool, especially with a future version of the Quest with a higher resolution display. It could really be a very cool way to play some casual games, privately, on a big screen, with good audio, high frame rates, low response time, and maybe even some 3D special effects! At first you could start with something retro, like Doom 64, then maybe a game like Cuphead would be amazing, and it could also benefit from the higher than 60 refresh rate of the Quest. Also some controller enabled Android games like Asphalt or even Fortnite, would be perfect! Playing this games in VR would certainly be much better than on a smartphone, with touch controls, poor or no audio, low refresh rates, and a small screen that in most cases doesn't even have decent response time! Something like this could be ported also to the Oculus Go, but it would need a bluetooth (Xbox) controller.