I think any system that encourages abandoning technological progress because it's unprofitable is one that's outlived its usefulness.
This is basically how I feel. I think our systems were useful at one point, but they're becoming more and more obsolete now. There may be things that are still scarce, but much of the problem there is sustained by our economic systems. I would dispute the truth or relevancy of some of your examples, MSH. Some of those things (such as oil) may be scarce, but those resources wouldn't be as important as they are if the industries built up around them didn't work very, very hard to keep them so... which they only do because their scarcity makes them profitable. Other of your examples, such as fresh water, are abundant in some places and scarce in others... and a major factor in this seems to be that the infrastructure to provide that resource isn't built in places that can't afford the investment.
The most basic necessities, food and shelter, are not very scarce at all, but huge efforts are made these days to keep them scarce. Farmers are producing more crops for things other than food or being paid bonuses to produce at less than capacity, while huge portions of the food we still produce is thrown out. People are being kicked out of their homes just so that those homes can sit empty. I don't know if it's still going on, but a couple years ago when the foreclosure blitz was still new and highest-intensity, there were reports that a large fraction of homes were being kept off the market just to keep prices up...
I think that all post-scarcity needs is for basic necessities to be abundant enough. The whole problem is that a person has to make profit in order to survive, right? This means a person cannot afford to do work in a post-scarcity environment, because they won't be able to pay for basic necessities. If basic necessities are treated as part of the post-scarcity model, then this is no longer an issue.