nah, Quantum Computing is a hoax. To have quantum states near 0° Kelvin might not help with computing at all. And if it does we might have like 5 Quantum-supported Supercomputers world wide, that are most likely not even close to what people like you fear.
Also in a mathematical sense it should be quite trivial to crank up the bits on encryption and make it safe again. Sure the whole IT-Security apparatus would have to make a lot of old certifikates invalid and stuff, so in reality it might somewhat of a hustle, especially if you are only protecting against 5 dangerous machines.