Any chance the US would ever make it illegal?
There's always a chance, but I don't see on what grounds they could make it illegal. Banning it wouldn't make it worth any less any way. It'll still hold value to others and people will still use it.
Prohibition of alcohol didn't work in the US.
The price of liquor went up, and no one stopped drinking.
How many people in bitcoin land will delete their private keys if bitcoin was prohibited?
My guess zero.
