[DSMan195276]

Depending on "which" miners are shut down there is some potential for problems - if it is/was possible to shutdown a large percentage of the hashing power of the network then the difficulty to could be too high for the remaining miners to continue the chain (without it being so slow that it's unusable until enough blocks are mined to reduce the difficulty).

There's also the issue that, if governments are seizing the mining hardware, if they gather enough of it they could perform 51% attacks against the chain to effectively prevent it from working.

[davidgerard]

this is quite unlikely though. For comparison, during the Bitcoin vs Bitcoin Cash wars in late 2017, the main BTC block time went up to an hour - and pretty much nobody noticed, because all the excitement of the crypto bubble was happening on the exchanges, not on chain.

[austhrow743]

If the US gov goes after bitcoin there won’t be any exchanges left. They claim jurisdiction over anyone that so much looks at a U.S. dollar.