I enjoyed the movie, also, but don't think it would make a good musical because so much of what I liked about the movie was the set dressing, scenes of NYC from the time period and some of the fast paced visual elements.
While they can certainly design a set to represent the era, I don't think it would be as interesting. (in my opinion...)
But - I DID like the movie.
"Two drifters off to see the world. There's such a lot of world to see. . ."