If a person has to risk jailtime or their lives, they won't use it unless they're a radical with nobody that depends on them. That's my concern with the concept. Hopefully it will never get to that point but I'm just speaking in theoreticals here.
Discussion
But many still do, a very good example is the prohibition where many just went underground.
Never 100% adoption until the alternative collapses or the government consedes and capitulates.