Will say Three.js is amazing as far as simplicity compared to straight up WebGL. Also would hope they can do the reverse(move a 3D model and get coordinates of joints, etc). Then idk random thought about use is a store front/clothing pattern can go over the figures.
Being able to setup poses and step through them (maybe even with Inverse Kinematics animating between poses) would be great, especially for things like martial arts technique learning or dance instruction.
I was just thinking of something like this in the shower, awesome to see someone implement it so elegantly!