>The model requires just seconds to train on a few dozen still photos — plus data on the camera angles they were taken from — and can then render the resulting 3D scene within tens of milliseconds.

Generating the novel viewpoints is almost fast enough for VR, assuming you're tethered to a desktop computer with whatever GPUs they're using (probably the best setup possible).

The holy grail (from my estimation) is getting both the training and the rendering to fit into a VR frame budget. They'll probably achieve it soon with some very clever techniques that only require differential re-training as the scene changes. The result will be a VR experience with live people and objects that feels photorealistic, because it essentially is based on real photos.