This is a brilliant idea and striking demonstration of the effects of rising sea levels.
It has only one small problem. It doesn’t take altitude into account. It shows the same nicely rendered water level no matter where you go.
I don’t think it would be hard to do a lookup of the altitude of any address and move the water level up or down. But given the very rough depth map from Street View and the apparent lack of an “up” vector, it might be hard to properly intersect the water with the scene.
Here’s a more accurate example, without the nice immersive visuals: http://geology.com/sea-level-rise/
Still better than trying to depict a 1000ft water level near the top of the Oakland Hills. If that happens, we’d be long gone.