When slightly more powerful quantum computers appear which will certainly be at least 20 years from nowthe first things to be destroyed will be the dollar, euro, and other fiat currencies, banks, Visa, and Mastercard, long before Bitcoin because they rely on weaker cryptography.
I don’t think it’s something to panic about right now. Quantum computing is still far from being able to break Bitcoin’s cryptography in any practical way.
It’s good that people are talking about it, but Bitcoin can be upgraded if needed. We’ve had years of development and improvements already. For now, it feels more like a long-term thing to watch rather than an immediate threat.