I think you are misinterpreting the scope of what Sanders is proposing.

Could you please point to any evidence of Sanders plans to replace a market economy with an entirely centrally planned economy? That's essentially been your assertion, and I'm not familiar of any sources making this claim.

Here is a discussion re: energy sector https://www.politico.com/news/2020/02/02/bernie-sanders-clim...

And here is a report about his statements over the years to nationalize various industries: https://www.cnn.com/2019/03/14/politics/kfile-bernie-nationa...

There doesn't seem to be any limiting principle to way that Sanders approaches public policy.