Several people have put forward the idea of having a few rival super states, but just so everyone knows what we're working on here, that is not it. We're not making big artificial unions. We're making a bunch of micro states, to represent the world as it is. It's possible a second scenario for this mod will get made after, that has just five or six super states. For now, we're going with a lot of civs, no big fake unions. The only real questions regarding this I think are exactly how many and which ones to include, and which to make barbarians. This I think has been pretty well close to answered for now, but as we work on it we may see some things we want to change.
Personally, I don't see the appeal of a map of earth with 5 or 6 big countries. Half the games I've played on other scenarios turn in to that by the end. The diversity of this mod is going to be what makes it unique.
Ryse's map and 30-35 civs won't even be that bad.