The most difficult part would probably figuring out how to work a blimp into the plot of the movie.
While blimps don’t exactly move fast, they are usually quite high in the air, which would make such a stunt as dangerous as anything the actor has done before.
Blimps aren’t exactly a popular mode of transportation these days, so unless Mission: Impossible 8 takes place during a major sporting event, I’m not sure why a blimp would be available for Tom Cruise to hang from.
Which is not to say such a scene wouldn’t be awesome.