The way I thought of it was, we have pretty much destroyed everything the Fallen have. We killed the Devils' Prime Servitor and slated their Archons. We killed Kings' Barons although we haven't messed them up as badly. Exile are already -blam!-ed. Winter is in shit because we killed their Kell. And their Prime is said to be destroyed. And Wolves are either dead of locked up in Prison. So, they don't really have a choice now but to surrender.