I agree that we can do this. I do not agree that this is, strictly speaking, capitalism.
Capitalism =/= the exchange of goods, services, and capital.
Capitalism is the system that says the people who own the property constituting the critical infrastructure of an organization - the "Means of Production" - should get to make all the rules. That's it.
If I own a big beef machine that turns cows into hamburgers, it doesn't matter that I need 50 people to run it and 200 people to box and ship and sell the patties, the fact that I am the person who had enough money to buy the big beef machine means that my word is law, period. If I don't like the way they touch my big beef machine, they go away. If they don't like how unsafe the big beef machine is, too bad. Doesn't matter how much I sell the patties for - I decide how much I pay you, and I keep the rest (not exactly peer-to-peer). I own the big beef machine, so my say goes.
I agree with you that trade will exist until the end of time, and has existed since the first time Ook had something that Grog wanted and Grog decided it was too much energy to kill Ook over it.
When I say I am "Anti-capitalist", I mean (among other things) that I do not believe Capitalism specifically is the best (most productive, least ethically repulsive) means by which to engage in trade.
None of these opinions relate to trade or even the concept of capital itself, but rather the means by which we organize it.
To the original quote: It is hard to imagine the end of capitalism, because people believe capitalism is a natural facet of human nature. It is not; it is a big beef machine.