Voxels?

I was browsing the superinformation highway, and found something about voxels, (specifically, the voxlap library, written in C). I've learned that voxels lost the war against polygons, and now we all are stuck to them, and to silly clipping problems

But voxels are a pretty cool guy, they can represent real objects and even mechanisms with various resolutions using voxels as 'atoms', and they are not afraid of systems without 3d acceleration.

So, /prog/, tell me, in your opinion, why are voxels so ignored, and what could be the practical application that will make them a 'mainstream' technology?

In case you dont know shit about what i'm talking about, watch these

http://www.youtube.com/watch?v=TjmRPjnWJ5g
http://www.youtube.com/watch?v=Zl9CiGJiZuc

They're not really 'ignored'.  Look at idTech 6, which will probably use SVOs.  Everyone in the field are aware of the technology.
  At the level of detail we use today, polygons are simply faster and less memory intensive with better visual appearance, which is why they dominate the field.  This will become less true as more detail is added and polygons start approaching the size of a pixel, but current commodity hardware doesn't scale to that point anyway.