I don't know if maybe you think capitalism is the only reason people don't just lie in bed all day, but theory has been soundly disproven.
I can't think of a single example where there's not at least a core nugget of capitalist incentives driving things.
Sure, let's layer on some socialist policies, I'm all in favor of turning that dial quite a bit further, but that's turning a dial, not blowing up the whole machine because it's not working quite as well as we'd like it to.