I think there is still a long way to go before voxels will be mainstream. One of the main problems will be animating it, I don't see anything moving in that video other then the camera. Which is no surprise, animation of characters as well as trees is usually done using a simplified rigid body that has been 'weighted' to the vertices of the polygon mesh. Doing that with millions of small atoms will not be possible, so they have to reinvent animation and physics simulation as well. And there are many other problems to sort out as well, so they have lots of work left.