As much as all of this sounds completely far-fetched, much of the same strategy has already been accomplished in Europe with the EU -- and that was also "unthinkable" 20 years ago. The difference being, of course, that it's pretty tough to insist that Europe's currency or economic union was done in secret.
Britain agreed to it in principle when they joined the EC under Ted Heath over thirty years ago. Margaret Thatcher discusses the issue in detail in her book
The Downing Street Years.Churchill discussed the "United States of Europe" in
Triumph and Tragedy, the last of his six-volume WWII series.
I haven't seen anyone of like stature here discuss the NAU -- just a couple of fringe academic types and one Bushwacking Congressman.