And this isn't about us being omniscient. This is about us interacting with an omniscient knowledge base.

How would you bridge the gap between a knowledge system that holds information and a knowledge system that can determine meaning out of the information? There's Google trying to create something similar to an omniscient base with their Knowledge Graph and Google Now technology, giving me information before I know I want it. But it is merely based on extrapolation and assumptions. IBM's Watson is the same thing. It can already do calculations faster than humans, but it's still programmed to do so. The technology doesn't know why it does what it does, it can't give meaning, and in my mind an omniscient knowledge base worthy of the term singularity should be able to do so. That's a really big step AI needs to take that I don't think it will.

All for next to nothing.

Maybe for plastic, but if we have a completely subdivided manufacturing economy, the only thing worth making money off is the materials. Higher demands create higher prices, and the transportation costs will rise dramatically. Materials becoming dirt cheap seems like an assumption too easily made.

as it is not yet a single information processing system for the entirety of human interaction, as well as human transportation and energy use. But that is where we are heading.

I feel like I'm missing some vital information as I don't really get what you're trying to say here. Do you want every interaction to be connected to this network, the global brain? That the IT network will level the playing field, connecting everything and everyone and thus create abundance for all? Reminds me of Thomas Friedman's claim that the world is becoming flat (meaning no transportation costs, making place irrelevant in an infinitely connected world). This article by Richard Florida is a great response to why that line of thought is wrong.