If America imposes a strict ban on the use of bitcoin like this, it will be bad news for bitcoin and most likely this will cause the price of bitcoin to collapse. I suspect that what the American government is doing is aimed at controlling the price of bitcoin.
No, at all, I do not expect that the goal of the American government is to control the price of Bitcoin. It is possible that they control the price to make it volatile, increase the risks for investors, and spread panic among investors, but that is certainly not their primary goal.
Their first goal is to control Bitcoin by controlling all third-party services, so they started pursuing all third-party services, blocking them, accusing them of money laundering, supporting terrorism, etc.