There are fundamental weaknesses to this tech which they simply avoid talking about.
One is memory consumption, he tells us it isn't an issue, but look at the world.
it's essentially instanced copies of the same thing over and over. So the only way he's dodging the memory consumption hit is by taking the old fashion approach of modularising the environment into repeatable textures and meshes.
Another weakness is that while it might be fairly easy to render complex stuff, it is just as taxing memory wise to render a cube as it is to render that elephant statue. With polygons you just need to store 8 vertices and some additional info. Then you apply a cheap 2d texture to it. costs next to no memory compared to this method.
A third one is undersampling. Notice they keep telling us how amazing it looks, but at some point in the video you see them getting up close and it looks like a pixelated mess. In traditional polygon rendering that's easily solved by using bilinear filtering and multitexturing, but when you go volumetric it becomes tricky. You can start introducing procedural filtering as a compromise, but that's one of those areas that looks good on paper but is tricky to get to work decently in a production pipeline.
A possible workaround would be to use point clouds for rendering and polygons and textures for storage, so voxelising the scene at runtime, and guess what polygon engines are slowly starting to make use off...
On a final note, people wouldn't be so critical if this Bruce Dell guy wasn't such an ass. He takes worst case scenarios of games that look infinite times better than his own, and breaks them apart over geometry density. He doesn't share any technical info whatsoever about his amazing discovery.
Which not only leads to believe he's a snakeoil salesman, but it's bad sportsmanship when compared to the graphics industry that shares plenty of their technological breakthroughs with the industry at large. And he doesn't prove anything at all in that video. It's a low res screengrab with absolutely nothing of value about how the system works internally, ridden with marketing speech. Compare this guy's attitude to a John Carmack who open sourced all of his engines at some point. In my opinion this guy is getting all the flak he deserves.