That works for conversations held exclusively in the messaging app, but falls apart when trying to communicate in game.
Imho changes should be made with the goal of making things better for the 'law abiding citzenry' rather than to inconvenience the jerks. They will find a way express their jerkhood no matter what. ^^
Let spammers get blocked or booted. Little things like this make the game so much more playable - and, as in the case above, help us connect across barriers.