Funny, i was just thinking about those two fictional factions and this pops up. :D
I think fictional factions may play a bigger role in MP in the future, with lots of European and US aircraft modules on the roadmap, but sadly few or no new Russian planes.
Having two big fictional countries with planes manufactured in many differnt countries (like the indian air force in RL for example) would help make MP scenarios with a lineup that provides both sides a similar number of aircraft to choose from while avoiding mirror matchups that requier IFF, which some planes dont have.
Also Northeria and Southeria skins look cool.