I do agree that using Voxels in bigger games will be awesome. Or in a minecraft like game I saw recently- they are using something more complicated- basically smoothed voxels- to have the ability to remove a voxel, but the underlying surface is smoothed relative to the pieces left, rather than just cubes.
And you can't really get more accurate than making things out of "atoms".
Of course, in the humble indie bundle 'Voxatron', which had relatively large voxels, was a little taxing to run because of simulating all of them. But it really shows potential for the future of games using voxels