It would be an unenforceable law. Members already pre-shun people who don't live up to the "standard". We already have tons of statements about, "not everyone in the hall is good association". Even a legal edict would not make a major change unless the GB wanted to revers the policy for the good of everyone. And that would NEVER happen for a few reasons.
1st - it would tell people, we have been wrong and cruel all these years, and don't listen to us any more.
2. People would stop coming to meetings and going out in service.
DFing is the BIG HAMMER they have over everyones head. That gone, the Cult Falls!