The idea of removing the signature display is good, but how can it actually prevent prohibited members from shit posting? Because they can still post just without the added benefit of being part of a signature campaign, chances are these prohibited members will take it personally and bring their worst in the forum by complaining of unfair treatment as well as to ruin some threads with shitty posts after being banned from having signatures. This strategy will take some time and I don't think this shit posters will even try to improve their post quality on a month of prohibition.