Especially because then we could have a Tom Cruise IMAX action film where the action is actually good #flameon
I have to be honest, I didn't really like MI Fallout... and the action for me was quite underwhelming. I'm not trying to sound snobbish - it's always ridiculous to see average movie-goers pick apart films made by professionals - but to me several of those chases scenes, the Paris scene, the helicopter chase... it just fell flat for me. The bathroom fight scene was amazing, but that's it. They just lacked the rythm, lacked the momentum - I should re-watch the film, I'm sure, but I wasn't blown away by what I've seen.
The idea of a Nolan/Cruise movie is too insane to think about, haha. That would be bananas.
But - I strongly suspect Nolan isn't a fan of Cruise. Cruise's mid-life crisis while dating Katie Holmes in 2005 nearly sabotaged Batman Begins' thunder. Plus Cruise didn't let her return for The Dark Knight. She starred in Mad Money in 2008 instead and Nolan had to re-cast Rachel Dawes with Maggie Gyllenhaal.
That lack of actress continuity with Rachel still really bothers me to this day. It's an imperfect trilogy because of that.
Obviously never say never, but Mr. Nolan casting Mr. Cruise is the closest thing to 'never' that I would bet my money on--the reasons being those already mentioned (action for the sake of action not being what Mr. Nolan does, Mr. Cruise negatively affecting the Dark Knight trilogy continuity, etc.) but also that Mr. Cruise's super-stardom makes it hard to be sucked into the film and see his 'character' as anything other than as a vehicle for Tom Cruise the Superstar.