Does Dust Theory imply that every time you go to sleep, or lose grasp of your surroundings, your dominant reality collapses and a new one takes shape? After all, it's only your experiences that create your coherent world. I think it would be similar to the Autoverse's 'removal' of Permutation City from its reality.

EDIT: Hmm, no, there would just be a slow degradation of consciousness. Nothing that would explain my memories of dreaming last night and taking a ninety-degree turn back into reality upon waking up; that dream would have become my reality. So I'm fairly confident Dust Theory is false, because of the sheer unnecessary baggage my reality appears to have.