I've heard this sort of thing before, and I've never been totally sold on the idea of post-scarcity economics. Mostly because I think that if you give me molecular nanotechnology, I, personally, can make good use of basically as much matter and energy (the only real resources) as I can get my hands on, with only moderately diminishing returns. If that's true for even a significant minority of the population, then there's no such thing as a post-scarcity economy, merely an extremely wealthy one.

In practice, I expect us all to be dead or under the watchful eye of some kind of Friendly power singlet by then, so the point is rather moot anyway.