The digitization of information and media combined with the Internet and widespread use of electronic devices practically means that in some important ways, we are already grappling with post-scarcity in certain fields. 600 years ago, "books" and other texts were rare and valuable, then there was an explosive transformation with the invention of the printing press. But while much easier, there was a still a laborious printing process and a copy of a book was still a valuable thing. Now, a "book" can exist as an .epub and be copied perfectly a million times practically for free. It is similarly true for movies, photos, recorded music, news articles, etc.
As a capitalist society, we've really struggled how to deal with this post-scarcity arrangement. We understand in the abstract that this stuff is important, and that creating it is a laborious process, but we do not really know how to assign copies of those works value (because, once created, they immediately become infinitely abundant). The best idea we've seem to have settled on is articifically creating scarcity by locking the digital works behind paywalls and subscription services that require an account, or maybe DRM paired with a EULA. But I think people generally, and the HN crowd specifically, understand that is a lousy arrangement.
Could energy become so abundant that it is also post-scarcity? Between fusion energy and advancements in solar, wind, and geothermal energy, maybe! It is a tantalizing vision to dream of, but what does that look like under capitalism?