I can imagine them generating digital reality on the fly for users - no more dedicated applications, just pure creation on demand ('direct me via turn by turn 3d navigation to x then y and z', 'replay that goal that just was scored and overlay the 3 most recent similar goals scored like that in the bottom right corner of the screen', 'generate me a 3D adventure game to play in the style of zelda, but make it about gnomes').
I suspect the only limitation for a product like this is energy and compute.