first howard and now norton...i absolutely understand marvel's point of view, but they are setting a bad precedence with these casting changes.
Marvel had to have known that create input would have been an issue with norton from day one, yet the decision to cast him was made anyway and the film/franchise has been better for it. Norton makes the tih better the way downey makes im better. They are damn good actors who get the character and bring their considerable talents to a genre of film that normally doesn't have such a luxury.
If it's a money issue--and i suspect some of it may be, then marvel needs to suck this one up and get back to the negotiating table with norton and make it work.
It's no secret to anyone what marvel's plans are and it would be beyond naive for marvel to think that they can continue to low-ball actors (quality actors at that) for these films when the actors (and their agents) are quite aware of the stakes.
The avengers is becoming one of the worst kept secrets in hollywood. Quality actors are going to want in, but not at bargain prices for every film. This doesn't mean marvel has to get fleeced in the process, it just means marvel has to do a better job of negotiating the terms with actors for these films. Because changing actors every time there is a dispute will be bad for marvel in the long run.
With the con right around the corner, it's going to be interesting to see just how much sway the fans have or not with marvel.