Good question. Many were/are also part of the other group, so they must have established some "rules of engagement" to break down barriers built around entrenched thinking, while keeping it civil? Then there are always a few in a group as large as this is projected to be, who know how to encourage open, and frank discussion without ruffling too many feathers. I already see a few names on the list who have the experience, and leadership qualities to fill the position. Eventually a group leader/s will emerge to guide the process along. Like a High School dance, it will be awkward and quiet at first, but by the end of the night everyone will be dancing and having a good old time.
Main thing is to leave ego behind when engaging in the thread. If you have authored a theory, or have advocated for a particular one; embrace being challenged on every point, every word, every equation...without taking it personal. It is only in that way can the merits be determined. After all, there are many theories, and not all can be right, which means most are wrong.
Hopefully, in the end the wheat will be separated from the chaff, and we can bake a cake. Oh, and never forget to have a little fun while at it.