I am thinking this will be for altcoins and exchanges and not bitcoin.
Technically, yes. The government can not regulate every decentralized cryptocurrency and privacy coin but they will want to regulate the initial offering (crypto developers), CEX, and some stablecoin like USDT to prevent another market cap manipulation which was once done by the USDT team.
I would say that it is not a horrible idea neither. All those stablecoins collect hundreds of billions of dollars from the investors and they make a profit from it and they get away with it. I mean if everyone gave me 100 billion dollars, I would be able to store it well enough and make enough profit from it and could pay it back whenever asked as well.
Yes, it's not an unpleasant idea that's only if the government organization that will be in charge of the regulation won't abuse the system which we know is not possible because everything that has an advantage will always have a disadvantage.
This is what some people hate about regulation and the privacy people won't get through the regulation.
It would take me a year to get that going properly with the legal papers but I would be easily handling that eventually, not really impossible. So, why trust tether? Why trust any company at all for it? It is such a huge amount. So, them getting some closer eye on them would be fine by me for sure. They are not decentralized anyway, they deserve it.
The game played by the Tether team was among the thing that make the SEC introduce KYC, regulation, etc in crypto but the regulation the OP was talking about is not only about Tether but all Stablecoins which I believe would harm the privacy level in the Stablecoin market.