Although we are creating systems to prevent truly huge faction imbalances (51%+), in general we are not going to force faction balance. In fact, we don’t think of this as a four-sided game, but potentially an infinite-sided one!
Factions in Eternal Crusade don’t “win” by owning more territory than everyone else. Instead, you advance the cause of your faction by accomplishing distinct goals that provide rewards, give you recognition, and/or affect the long-term narrative. If one faction seems overly powerful, other factions can work together against them. This can take the form of an official alliance between their leaders, or happen naturally by virtue of the fact that the most powerful faction has territory that several other factions want.