If a government would want that much to get bitcoin eliminated from the economy they will not target the chain or nodes or the hash rate, they will go after users.
As I said before and others did, if they would make holding cryptocurrencies a felony with mandatory 25 years, would you still use it?
That makes sense, however, there is an essential factor you seem to be missing, a single government can only enforce rules upon its citizens, if the U.S bans crypto altogether, the Russians, Chinese, Iranians and perhaps some European countries would want to buy it more than anything, banning crypto is a risky move to any government if done individually because jumping out of the train does not make it stop, it could simply keep moving and you will be left behind, you need to actually STOP the train, and that would be by "destroying" bitcoin and not just ban it.
No, it doesn't. We don't actually "hold cryptocurrencies". What kind of law could the politicians propose/make to outlaw this new kind of ledger? Should developing such a ledger be illegal? Why?