A system where you take money out of the equation. You’re right that we have to take human behaviour into account. That’s one of the more prominent critiques for Marx by neo-marxists. I’m not saying that we replace capitalism overnight. The technological progress brought about by capitalism has lifted billions out of poverty (albeit at the cost of irreparable damage to the biosphere) but that doesn’t mean we shouldn’t strive for a better system. In the meantime, being aware of the pitfalls of capitalism and trying to build class consciousness and a more equitable society is still a worthwhile goal to have. It took hundreds of years for capitalism to evolve and entrench, going from feudalism to Industrialization and now Technological Oligarchy. It pervades so much of our thought, culture and way of life that any proposed alternative is seen as wildly radical. We have to learn to gradually disengage from it if we hope to bring lasting change.