Please don't put it down as should.
If it's a should... why would anybody bother? You need to put in the FAQ, that if a character has a newly banned quality or flaw, that they must make karma payments to get rid of it.
I.e. 1 karma in 4 or something.
else... it's even worse than before the flaw was banned.
GM: "You know, you're supposed to pay off that flaw with your karma, right?"
Player: "Yah, but you don't have time to enforce things in game about it, so I'll just ignore that should"
Sorry, but I see this all the time in living campaigns.