Cracking encryption schemes is about time and resources, nothing more. With enough time and enough resources, I can break any scheme we have thus far devised. So quantum computers are scary because . . . ? They have the potential to solve certain problems faster? Maybe the issue isn't with quantum computers, but with the way we secure our valuable, private, and/or classified data?
Quantum computers will eventually break Bitcoin's Blockchain, but that's just one side of the story. Critics often overstate the quantum threat to our current encryption schemes. They don't account for the potential for quantum computers to develop new encryption schemes.
If you keep up with the quantum computing news, you know China has huge quantum goals. Now they're backing them up with a $10-billion "National Laboratory for Quantum Information Sciences," a nearly 4-million-square-foot campus to drive their leadership in the quantum space.
There is far too much hyperbole out there about quantum computing's impact on security and encryption. And that means something coming from me, cause you know I'm a homer. I get that people are alarmed, but many times the people talking about the topic have no expertise at all.