But if Bitcoin is relegated to only the black market online - you can use it but don't let anyone find out - that would hamstring it. Bitcoin would never reach its full potential.
The premise in the first sentence above does not lead to the conclusion in the second sentence. Certainly Bitcoin adoption will be hampered in nations wherein the powers that be can threaten users with real violence for doing so, but this will do little to prevent adoption in locales where this is not so.