Check out what John was given to write about the different churches in Revelation. There is no coming together for those churches either unless they change their ways. The only coming together that is going to happen on this earth is when most of the churches come together under the one world religion.
I doubt a single mind or heart has been changed by the self-righteous, Pharisaical, doctrinal volleying that takes place. If anything, people stiffen their stances.