It's really a shame that Shaun is basically flopping in the U.S. I've seen it and it's a really funny, heartfelt film. O well, at least it's doing solidly overseas.
That would be very interesting. I think Gibson is a great director, regardless of his horrible behavior to certain people, so I would be up for a comeback from him.
Then again, MI: 5 has the disadvantage that it's not in 3D. With 3D it would've performed better although 3D isn't really a big thing anymore in the US.