If left unmoderated, it could (and likely would) become the same unproductive trolling nonsense that pushed people away from WoW. The tower only holds 16 guardians at a time (I think). I say give an area of the tower that those interested could go to in which to participate. That way if someone is a troll, he's right in front of you (not hidden behind a box in a basement of an unused building somewhere in the city).