Take this idea, and apply it to Google Earth. Have it procedurally generate the rest of the data as I zoom in.
Its incredible I can check out my small home town on Google Earth now entirely in 3d (which wasnt the case just a few months ago). Yet the trees/cars are still these blocky low resolution things sticking out of the ground. Imagine Google Earth procedurally generating a high resolution mesh as I zoomed in. Train it with high resolution photogrammetry of other similar locations for the ground truth - and let me zoom in endless in their VR app