Regarding the article, How does "Downey view the iron man movies"?
That once he made a "tent pole" franchise, that even if he tired from playing the role, he was in it for the long haul.
To get back to topic, if Nolan approaches Bale, Bale will come back. Like the, article suggests, Bale in just 20 mins of the film, will easily put this movie, in the top 1-2 grossing movies of all time. (So Warner will easily cut him a blank check, or Bale, a cut of the gross (like Keanu reeves got for the Matrix) or hell, even both, with Bale making a cool $100-$150mil (if the movie is tha successful)
It would be real cool to see Bale and Cavill face off in my view.