I don't mind it, to be honest.

I already figured that's what they'd do, and I really don't mind. It's necessary if the Marvel Cinematic Universe is to continue on. I don't flip out when James Bond gets recast. I mean, sure there will probably be certain actors I'll refer to as my favorite for each character, but that's just normal. I want the universe to continue on, because they'll eventually get to adapt some pretty great stories from the comics, and to see what they've been building on for several years end just because actors are getting old would be a shame.

Having seen ruffalos hulk I would like to say not to worry in his case he is easily best hulk I have seen in the avengers. As for the filmverse yeah it will spawn issues if actors get bored of their roles. But the avengers draws strength from the actors not being new to roll ( bar ruffalos hulk who as I said above was solid anyways)

Honestly, it's eventual and it's going to happen. We can't do anything about it. Personally, I can't see anyone succeeding RDJ as Tony Stark but it will happen and we have to accept it.

Yeah I also don't really mind. In the cinematic universe, people don't come to see Bruce Banner. They come to see the Hulk. That type of recasting doesn't bother me. Tony Stark on the other hand is a pretty big deal and probably more prominent in the cinematic universe than his Iron Man counterpart. But it is inevitable that RDJ will give up the role and that a remake will ensue. As long as it's good I don't mind if it's different.

@noj: I still don't care about him getting replaced, it's going to happen eventually, and I accept it. My opinion still stands.

I disagree with the original post. To me changing the actor is like getting a new artist & writer to work on an ongoing comic book. The style change all the time in comics so to me the same concept used in comics could easily be reapplied to movie continuity. It could work so long as you cast the right actor and the directors know what they are doing. Truth be told, I never got the impression Batman Forever & Batman & Robin was meant to be a continuation of the Tim Burton version of the movies. Regardless, Batman Forever and Batman & Robin are terrible examples because the movies were terrible overall. It fails to sustain coninuity because Warner Bros./ DC comics didn't know what they were doing at the time.

I have no problem with it. I would prefer that all the characters would stay with the same actor but I know that the actors end up wanting to do different roles so I have no problem looking past it if it is recast.

I really look at it like with how a comic book gets a new creative team, the writing may be different and the look of the characters might be different due to a new artist, but in the end it's still the same characters I've been reading.
 
The worst thing I think Marvel could do at this point is reboot the movies, this is something that many hate about the new Spider-Man movies and quite frankly after you see the same origin story a few times you get a little sick of it, especially in a movie. I personally don't have an issue with Marvel recasting different actors, at first I was worried about the new guy playing Hulk in The Avengers as I really liked Norton's Hulk/Banner. But after seeing the movie four times now I actually like him and think he's great in the role. I don't think recasting different characters is really that big of a deal, the trick though I believe is simply finding the right actor to take up the role, but it also doesn't hurt to bring in someone who brings something new to the character.
 
But rebooting is probably the worst decision Marvel could make, people know these characters and they know what makes them tick and throwing that all out the window and starting over, because one actor decides they've have their time as Tony Stark/Captain America/Thor/etc. but it's time to move on, would more likely cause Marvel to loose more viewers than to gain. Really though, with so many characters and so many stories that come with said characters, after you do three Iron Man, Captain America, Thor, and Hulk movies it would probably be best to give those characters a rest and let newer characters get their chance in the spotlight, and later on come back and possibly bring back the older characters, maybe with new actors and a new direction; not start over but instead just pick up where the last movies left off.