Earlier quoted context omitted.
A post-scarcity economy is never going to be able to create more lake-front properties or more seats at the top pop star's front-row. (Although I suppose you could argue: VR. But I doubt people even 100 years from now will agree VR is just as good as the real thing.) When you think about it, there's a lot of stuff that'll still be scarce even when we have magic robots that can build everything instantly.
If you want to keep capitalism in a post-scarcity society- all you need to do is counter the exponential production with exponential consumption- breed tribble-human hybrids.
If anything that anyone wants is limited such that enhancing one person's realized utility is a trade-off with someone else's realized utility, you don't have a post-scarcity situation.
Which is why post-scarcity isn't really something we are ever likely to need to worry about.
What we need to worry about is a scenario with scarcity where large masses of the public are (some in a static way, and some in a transitional way that, with optimal policy, could resolve given time), through arrangement of capital and the relative utility of automation vs. labor (including when it comes to producing additional automated production units) unable to contribute significantly to output, and thus have nothing to sell in the marketplace.