If the US government ever makes a move against miners in this way, miners should stand up and refuse to comply with these terms. As previous posters have mention that mining companies already pay taxes and regulation costs etc

There is no need for a registry? Its getting out of hand when your own GOV wants a list of people doing "specific activities". Doesn't matter what they are or what peoples opinion of those said activities are. The question is, where does your rights TRULY end, and where does the governments begin?

Just like flagging segwit when it was first launched miners had to vote on it by accepting it or not. If this ever comes, as a miner its your duty to just reject it on face.