If quantum computing will be reality someday - and if this technology will be really good at breaking encryption, codes, algorithms - all kind of mathematical problems.
Then we are not the ones who should worry, whole banking system will be destroyed as they rely on encryption to keep their transactions and databases secure.
This is certainly true.
We have quantum processors - but they are horrible now, they need special conditions to operate (to be cooled to absolute zero and be free from any electromagnetic interference).
My point was that 'horrible', expensive and shielding requirements don't matter. The disaster occurs as soon as one exists with enough qbits. Presumably it's existence would be kept secret, but we'd know from the open research how close it was - and that by itself would be enough to cause problems.
tl;dr: without implementation of qc resistant systems, the effects will occur at the tip of research - not when we all have a qc on our desk.
Bitcoins will begin to disappear all of a sudden and it will be a big mystery. Thats how we will know its quantum computing. The price of bitcoin could crash if we are not prepared.
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