Hm, it's a good thing the Ebonheart Pact is so popular. Just look at the size of their territory, they need plenty of soldiers to keep that secured before going to conquer anything. And considering the amounts of people who love Nords, Dunmer and Argonians, it's quite clear which is going to be the top faction when it comes to numbers.
Should alliances form between the factions, DC and AD teaming up to stand a chance against the EP would be quite interesting.
Oterwise I'm afraid the other factions and the corrupted Empire will soon be overwhelmed.
Though, I wonder how the communities are going to be... after all, every second Nord might be trying to pretend to be Dovahkiin, and with Werewolves and Vampires confirmed I'm expecting plenty of people trying to replay Twilight scenes with a Nord-Bella, Vampire Edward and Werewolf Jacob. Oh dear...