There are many things missing about this suggestion.
For starters we already have a survival gamemode, elite survival.
Also this sounds more like factions than survival
With anyone being able to essentially setup a factions server, I don't really foresee this passing through. I know one way a developer could make it work, along with the guild system that is on the confirmed list, but whether they would actually do this is questionable in my prediction.
But back on base with the ability for most people to set this kind of thing up in the matter of minutes.
Is there any special mechanics that would make it more appealing?
Any ideas for map layouts?
Any other details that you may be missing out on?