Do you realize that basically the entire world runs on encryption? If, and that's a big IF, quantum computers get to a point relatively soon when they can break popular algos such as SHA-256 there are going to be many things to protect far beyond crypto.
Secondly, there is already much work being done to protect BTC from quantum danger. The security measures can be updated to mitigate the threat with quantum resistant algorithms. It's not like this is some secret coming out of nowhere.
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