We're early days. Models will soon interpolate all of that. Eventually in real time.

I wouldn't knock the research. The results look impressive to me.

We probably won't. GS is a reconstructive method, so when data is unavailable, you can only perform poor interpolation. You would need additional generative, not reconstructive, models. However, this would open the door to unfaithful augmentation again.

Different applications.

GIS won't want generative hallucinations.

Consumer mapping apps, social applications, and games (eg. flight sims) will want the maps to look as good as possible.

GIS don't want half exploded buildings either. Nor would they care about photographic textures on the 3D models.

You’d be surprised what GIS - or at least GIS - adjacent customers want. If you think about any cute-but-useless map detail that comes to your mind there is likely a paying customer for it.