When VR starts delivering on the "virtual" part of the "reality" concept whereby my girlfriend, uncle, or neighbor can put on a headset and say "why go back?"
or
When VR doesn't merely solve for an "immersive" experience, but rather provides for a better way to interface with 3D "space" than does a 2D monitor.
I'm with you there, but that's one application to one sphere (gaming)of VR application.
That being said maybe that's all "3D interface with 3D objects" is right now?
So might be more accurate to say: When our current 2D interfaces like file systems/operating systems, entertainment (movies/tv), socializing, etc are addressed a 3D objects in a 3D space.
The mod community have made beat saber incredibly immersive in the way of light shows and "wall maps" which go beyond just hitting blocks with your sabers. I'd recommend checking out an example like this - https://www.youtube.com/watch?v=pZd_I86i8eQ - which is like being inside your own personal rave
or
When VR doesn't merely solve for an "immersive" experience, but rather provides for a better way to interface with 3D "space" than does a 2D monitor.