I've written about money and the future before (see blog archive) but their are some other points to be made. Sure technology will improve counterfeiting to the point that money cannot survive but then consider the implications. Like the fact that the capitalist system itself would come to jeopardy. Then lets look deeper. Without money their can be no taxes. This puts current government structures in jeopardy also. This is not a what if. This has already started. This is now.
The Messian Utopian Ecopolitical system is something I intend to write about soon but what it is is an adaptation of man to a money less society. The other solution, the one that will be universal outside the city project, will be much more grim. The objective of "the beast" will be to preserve money at any cost and they will use totalitarian methods to ensure this. This will include restrictions on the availability and development of technology. Capitalism cannot survive technology.
But keep in mind that currently their is no feasible way to counterfeit gold. Gold will be the last money left standing.