This is one of those questions like what will you do if there's a solar flare that destroys the Internet? Should we really worry about this?

Quantum computing is a joke. The rivalry is based on how much computing power one dev team has over the other and they show off in scientific journals that it takes their computer a given amount of time to resolve this or that problem. The most important part in all of this is that these problems are written in a language a quantum computer can process. It cannot process our binary data yet. Once it gets good, you'll have other things to worry about because your bank account is binary and so is your digital ID.