I think that really overstates what the effect of copyright elimination would be. A lot of traditional methods of monetization would be harder to make profitable, but stuff like Patreon or Kickstarter would probably still work pretty well. At worst, we'd be left with people making content in their spare time and not for profit or to make a living.
That would suck, no doubt, but I don't think it sucks as much as a copyright term effectively limitless in duration.
It also ignores what we're missing out on now because of our copyright regime. Anyone should be able to make a Star Wars movie by now, or a Spiderman open-world RPG, or an epic poem detailing the later exploits of Meriadoc Brandybuck, or whatever the hell else. There is a shitload of derivative works we're missing out on because of onerous copyright restrictions, even on works where everyone involved with their creation has been dead for fifty years.
Anyway, the main point of my previous post was not to support eliminating copyright. Mainly, it was to point out that if you support dramatically reforming copyright - twenty years and no DMCA would get nearly as much opposition from special interests as would eliminating copyright altogether - you've got a real uphill battle and no clear allies, despite having more in common, probably, with people who what to eliminate copyright rather than the maximalists. So I'm sympathetic to the view of "fuck it, let's just get rid of it, then" even if there would be some negative consequences to that.
Finally, there is something to be said for taking an extreme opposite position even if it goes further than you would prefer. I think I'm more likely to see reasonable copyright happen in my lifetime if I support people who want to abolish copyright, than by trying to reason with people who want it to be limitless in scope and duration.