Nice article. We are already preparing for this, Post-Quantum Cryptography algorithm being developed since 2006 or so...
Not long ago, I've read an article that quantum proof algos are prepared, once we have working quantum computer, we can test them (sorry, can't find the article now)
These algos can be run on current hardware, so if blockchain switches to these new algos, we should be safe ;)
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Yes, you should check out the quantum key distribution article and the quantum blockchain. For the sake of brevity I haven't gone into it that much, or this article would have been four times as long! I think we'll be alright, it's scary and exciting all at once :-D
Cg