the reason all boards die and aggregate around /po/ is because other boards ban talking about politics. But you can't ban politics since politics is involved in every aspect of life: culture, arts, science, literature, and so on. It is a paradox to have multiple boards and ban political talks surrounding those subjects in said boards.
The only way to bring other boards to life is to encourage the BO's in other boards to not ban political talk and let every board have its own type of political subjects. Or else everyone will just "lump up" in /pol/ as always.
Call it /pol/'s second Law: The longer you keep posting the more likely you are to get banned and end up in /pol/.