This "threat" already exists with cash though (and with cash you can throw it into an ocean or burn it, but the blockchain will forever record your Bitcoin ID and you have to hope DHS never figures out which ID is yours).
And there is always the Tor network for anonymity.
But good luck trying to get the value out that you put in. Dollars and Euros are relatively stable compared to bitcoin. There is a much higher guarantee that you're going to get the same value out that you put in with Dollars or Euros compared to bitcoin. Bitcoin looks like a great investment until you actually try to turn it back into dollars or euros.