I was thinking about this today and how it related to the tau orgy, wherein the Fremen are somehow aware of each other in their minds. This is strikingly similar to the ideas Frank expressed about the human species as an organism and the Avata in Pandora. As the spice amplified this awareness, perhaps it is necessary as part of the maturation of the 'humanity' organism i.e. it is more aware of itself as a whole.
Hmmm...i wondered if the Net was also an extension of that, but we could only see it from Duncan's eyes...what if more people (other than Marty and Daniel) could access that and the impact on the GP?