Although regulations may reduce our anonymity or lessen privacy in transactions, as long as the system remains intact and functions the way it’s designed to, Bitcoin will remain unstoppable.
Nobody can do that at protocol level (lessen our anonymity or privacy in transactions). All they can do is to regulate
centralized services like exchanges. Bitcoin is like cash. When you go to a super market and buy something and pay in cash, the owner doesn't ask you for your identity to make the payment but when you use a centralized service like banks (eg. debit/credit card) you have already revealed your identity.