Rothbard in no way sees political action as the only way forward, he has laid out a multi-tiered path, political action being only one of many tools. He emphasized "Ed-ucation" (sorry I had to!) of the population in order to bring about long term change.
He is merely suggesting that the black market strategy all its own cannot be the path to liberty, and rejecting political action all together may not be prudent.
A good breakdown of Rothbard's larger strategy.
*Advancing the Ideas of Liberty Daily*
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