Allow me to preface this by saying that Bitcoin should absolutely upgrade to a quantum-proof blockchain, and it is extremely foolish if Bitcoin devs continue burying their head in the sand. HOWEVER, it is hard to conceive of a scenario in which both: 1) Quantum computing is achieved before Bitcoin becomes PQC, and 2) The actors with quantum capabilities choose to use their newfound powers to “break” Bitcoin. I’m not even sure why someone would opt for #2; there’s very little clear economic benefit to doing so. In this respect, quantum probably ends up playing out similarly to nuclear weaponry. Yes, it will be achieved, but the consequences of using said technology for nefarious means greatly outweigh the benefits of doing so.

what if China gets hands on quantum computer first? they might want to rekt BTC as it is a risk for capital outflows for them.