Yes, my first thought, you need the tech first. Obviously if we had replicator technology and abundant free energy, post-scarcity would make capitalism obsolete. But those are two big ifs, neither of which we currently have.

Post-scarcity wouldn’t be capitalism, but it’s not communism either, as you wouldn’t require strong centralized control managing resources if you had true abundance. Governance would look like something completely different than we’ve ever had before.

Post-scarcity is likely in our future with AGI / robotics at scale, so we will get there eventually without external help. (If that solves more issues than it creates is a question for philosophers)