You would have to 'regulate' the entire internet to stop bitcoin, making the internet much less free and anonymous for everyone
I get tired of refuting you guys over and over again.
Well, I can see how being wrong so much would be tiring.
The authorities can tax those they identify, and then they can make those they identify culpable for all activity on the coin since mining to present, unless those individuals will present the id of those they bought from and sold to.
Thus with this approach, everyone will be forced to give up their id.
Thus for sure they can regulate it, because
anonymity is not strong in Bitcoin. Only a minority need to fall, for the rest of the dominoes to fall.
There are so many loopholes around regulations of bitcoins, I'll just say this: With a few simple steps to protect your anonymity, no reasonable court of law would be able to prove the actions behind multiple bitcoin accounts were 1 human being.