Random Question: Will Quantum Computing kill cryptocurrency like Bitcoin?

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I’ve pondered this quite a bit. In the future when quantum computing is cheap and accessible for all, and essentially all PC”s we have today are rendered obsolete like a Commodore 64. Will people be able access or will crypto be available if everyone has jumped to a quantum computer. Something like Bitcoin which was created by a mystery person how would you bridge that gap from PC to Quantum without the developer to do it. This may seem like a silly question but I’m actually searching for legit answers.