> Has anyone said replace them with central planning?
>
> No one I know has.
>
Production with division of labor can be either planned or unplanned. Those are the only two options. If it's unplanned it's a market. If all production is planned, it's central planning - no matter how decentralized, democratic or participatory the decision-making process is. Even Michael Albert's Parecon is central planning - there's a single, central plan.
SA