Good stuff, nice to see them actually working together for once! Sadly it probably won't last long, because they still have all their problems, it's just now put aside so they can survive.
I'm pretty sure every alliance ever in history was made by two groups of people who hate each other both mutually not wanting to get killed by a common threat.
So that adds up.
My only question now is, how long will Ozzy's grip on the parties' wheel last before the infighting begins anew?