Sure it could be even worse, but is that supposed to be a rationale for accepting his approach? Just don't understand what point you are trying to make.
That you are being incredibly hyperbolic and alarmist when you are equivocating what are minor tweaks to what is, and what will remain a mixed public/private market economy... to full-blown-complete nationalization.
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.
If Sanders' proposals amount to nationalizing as much economic activity as possible, you have a lack of appreciation for what is possible.