I don't think that's a good idea. Like somebody else pointed out about Baptists, the online vitriol will be taken within denomination. It won't be eliminated. Not by a long shot.
What it will do is something worse- limit inter-denominational interaction. When that happens, we all lose in real life.
It's understandable that people hate faction and contention. It's part of our human nature. We want unity AND diversity, but apart from perfection under God, the perfect balance of the two isn't possible.
So in the meantime we fight. And thank God we do, because if we are not fighting then somebody is exercising too much power over the opinions of others.