If it gets outlawed, the value will probably go up...
It might be possible the US will outlaw ownership without a custodian, Europe and Asia won't though and people can just travel to Europe when they need to buy or sell...
Not a single decision will really be enough for other countries to follow so this one is really expected to happen.
I quote one of the headlines of Ray Dalio's talk about Bitcoin.Ray Dalio Believes That The Government Will Ban Bitcoin Sooner or Later, and He's Wrong.
Bitcoin can't be stopped.
+9999 to this.. If they wanted to ban bitcoin then they should have done this when it is just starting to make out some noise but now its already too big for them to handle it out.
Even though lets talk about on the smaller scale, they cant really still able to do something which does simply proves out that no one can controlled it.
They can regulate exchangers or services but it wont really be completely enough to stop it.