I don't think quantum computers will "break" Bitcoin. Developers will introduce a quantum-resistant algorithm before quantum computers become a threat to the Bitcoin blockchain. It's very likely the community will approve such a decision as it's in everyone's best interests. With how solid BTC is right now, I wouldn't expect it to dip in price now nor in the distant future. The only way it could fall to $1 is if there's a full-scale nuclear war or the whole Internet is shut down for good. We may be decades or centuries away from seeing this become a reality.
If you've missed the "Bitcoin train", there's still an opportunity for you to strike it rich in the future. Go check out altcoins to see what I'm talking about. Most of the new ones begin trading at cents of a USD, only to end up being worth hundreds if not thousands of dollars (USD) in an instant. There's only one way BTC can go. And that's up. Who knows if BTC finally goes to $1m? Just my opinion

Quantum computer is not only threat to bitcoin but to whole current security system like AES encryption, VPN etc. Every new technology is not welcomed in the start, same happened with bitcoin and is also happening with Quantum computing. But Quantum computing is a reality and it will be here in few years.
Bitcoin is itself based on so many crypto concepts like SHA 256, ECDSA signatures and they do have threat from quantum.