I think there will always be someone or some group that will be against certain people rurning a forum, because ultimately, unlike these boards it is VERY likely to at some point have a unfair baised reaction, and you can't blame people for thinking that.
So I believe the whole community will flood to a single board? nope, just like the Matrix itself, we will end up in our own little pockets of resistance, these boards were our Zion.
MxO Mainframe doesn't look too bad, but regardless of any problems I know I've had with Symm in the past, I know he would run fair and equal forums. I'll jump around a few forums and see where people end up mostly, but I think like many I will have my own "home" forums, in my case being the Fallen Horizon forums.
So what might be a better idea is for a vote on which forums the community would prefer to class as our new "Zion", as it were, and then list your own remote base locations, so if people wish to stop by those places, they can.