I agree, like you said, "Capitalism is the continuation of a 10,000 year old mode of production." But what would be an alternative to supply and demand? Are strangers going to treat other strangers the same as they treat their own family members and close friends within small communities, towns, tribes, etc?
Not as long as mindsets such as yours refuse to wake the hell up. Throughout that same history we've gradually enlarged our tribes; they're the size of many millions, tens of millions, hundreds of millions and even billions. They're called "nations", large groups of people who have been brainwashed into coalescing into the wrong kind of societies full of people who actually believe they're independent and self-sufficient. You're one of them. Right now we have a unique chance to change that history, as the internet has changed that world into a true global village.
People don't want to. Generally speaking. Only some people agree with you some of the time. It is that simple.