During a press junket for his upcoming movie The Soloist, Downey was asked whether the second Iron Man movie would adapt the famous "Demon In A Bottle" storyline from the comics, in which Stark's alcoholism ruins his life and careers as superhero and corporate bigwig. His answer was surprisingly open:
Not really. As a matter of fact, I think that's probably best saved... because it's such its own storyline... We're going for the interim space [between Iron Man's origin and "Demon In A Bottle"] which is more a look behind the mask of someone who says he's Iron Man and what it really is to become a superhero.
On the plus side, that suggests that a potential third Iron Man movie would be where Tony's booze gets the better of him... and also that Downey and Marvel are definitely thinking of installments past this second one, which is definitely good news. That said, I hope this doesn't mean we're going to have to suffer through heavy-handed "Tony, don't you think you're drinking a little too much?" foreshadowing in 2010's tin-plated sequel.