It is too soon to worry about breaking a quantum-key. From a practical point of view, to be broken, it need first to be in wide use. For that to happen, quantum computers must be common place, or at least in the form of server (D-Wave is a remarkable concept, so far no practical use). None of that has yet happened. There are still some years down the road for a quantum computer to be useful, then the commercialization of it can take place. As of this moment, it is still just an experiment.
That said, I would love that moment when quantum computers start to be useful, be sooner rather than later.