For context, to compare and contrast with the quantum threat—because there are so many ways we can get hacked and it can get really confusing—breaking cryptography fundamentally would be like the mother of all vulnerabilities, because you can't just fix the code. There's no algorithm to fix. A good implementation of a bad algorithm is still vulnerable.
Second, if we deal with this as a crisis, there are going to be many more vulnerabilities for hackers to exploit without a quantum computer.