There should be a conference room in the new survival world where factions could negotiate peace treaties (mostly fake ones), exchange items and gear, plan raids, etc.
I would even be willing to build one.
That'd be good for 1.6.2 especially when everyone kills each other when they get out of the hall just because they betrayed them.
Yeah, for an example, Sith and Zenentrick/Zaxtran are allies, but we kill eachother on sight XD.