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If that happens, then all cryptocurrencies die too, not just Bitcoin. If Bitcoin is banned, but other cryptos get permission, then we can exchange Bitcoins for other cryptos, then exchange them to Fiat. But can the government do it? I sure don't. Because the existence of crypto is now a necessity, and a solution in the midst of difficult transactions at the international level. The existence of crypto is not to fight fiat.
You think that Bitcoin will be banned while the rest of the shit coins will be surviving after that . This can be the comedy of the century in the cryptocurrency world because none of these coins will survive without Bitcoin and it is a fact. No sane government will be blocking Bitcoin but you cannot say the same to thousands of other cryptocurrencies.
Suppose some government bans cryptocurrency trading, as long as there are users willing to transfer using P2P the market will be well and alive.