The whole first quarter or so of the story... the whole '63/ Brokeback section really feels like one of those classic two-person plays (or plays with very, very few characters) like Waiting for Godot or The Zoo Story. Or, at least I could envision it staged that way theatrically.
I could really see the first part, in one of those intimate, theater in the round type settings. In that way you would see the characters from all angles, allowing for a much more intimate experience. So much of the film was very subtle,that I think it would take that sort of production to provide the same feeling of being part of it all, in fact even there as voyeurs almost.
I am still struggling with the opera though. As with all these things,time will tell.