If a nation state secretly cracked Bitcoin’s cryptography, what could we even do ?

I can’t shake this worry ,,,what if the entire U.S. financial system gets tethered so tightly to BTC that a single coordinated regulator action could blackball it overnight? Last year the SEC finally greenlit multiple spot ETFs people cheered n all yet here we are, depending on a handful of gatekeepers who could just as easily pull the plug. Imagine When black-swan legislation hits, they order all U.S.-based custodians to halt withdrawals “for national security,” freeze addresses, or demand backdoors in wallet software. One morning you wake up, log into your exchange or custodian, and your sats are locked behind a legal injunction. All because Bitcoin became “too systemic” to ignore. We’ve always bragged that nobody can censor or freeze our coins yet right now, hundreds of billions of dollars in BTC are parked in institutions that answer to Congress (even if only 15% of total supply is custodieed there),, I just want to know if anyone else has run through this scenario: how does a truly decentralized network survive when such a critical mass of its tradable value sits under custodial agreements? Do we bolt for hardware wallets and split our stash across fifty jurisdictions? Or is there some stealth move like privacy tech to dilute KYC taint (CoinSwap, Whirlpool) that we haven’t even dreamed up yet?