Capitalism like it is now is only veiled feudalism. I think a working global system of supply and demand would work wonderfully. But we never had a really working system as such.

There isn’t even such a system in nature so far. There are always, always unpredictable factors from outside and extreme levels of corruption and malfunction from the inside everywhere you look (genetics is just an example, that’s how we age, lol). Luck is a huge factor in everything (or fate if you prefer).

I think the Singularity is a chance for our civilisation to rewire itself and to create a new system that is a meritocracy. Yes, this would involve capitalism to some degree, as well as social security to allow a freedom of opportunity. A post-scarcity world might stay an utopia though. We will always want more and create scarcity from scratch, so to say, and then find new ways to fight it. This is evolution, I guess.