If capitalism was over-thrown, our objectives would be to create a life worth living, to continue this rather moest website. Your confusion on political economy is to continue resources with capital.
Capital is a social relation.
Without accounting, a tractor is still a tractor but it is no longer capital. The slogan is abolish capitalism is to abolish the social relation, not the physical objects. Please note, also, the capitalists do not work in factories, it's factory workers that do that. Capitalist would find it hard producing anything by themselves. They need this highly developed system.