Activision already did that. Alliance could reliably win with 40-man rush to drek, so they nerfed premades. They’re fine with horde winning 99% of games. Alliance not so much, even if it results from social interaction and teamwork (which should be encouraged in MMOs).
Ironically, it was more balanced back then. Horde took a decent number of games by also rushing and using delaying tactics with 5-10 people with their superior base layout.