Just check the boards that block signatures to get an appreciation of what will happen. Don't forget that those who do post there, may not visit the forum if they can't display signatures elsewhere.
I suggest to block signature display in Meta board too. Why? As you can see around three months after launching day of merit system, Meta board has been polluted by hundreds of shitty posts from scammers, merit farmers, account farmers. They have visited the board to complain, to cry, to moan, and ridiculously to show their signatures up to our faces in order to hopelessly get merit points and money from their campaigns they participated in (mostly alt-campaigns).