Sure, IM got something going, but the issue lies with the hero himself. There's a reason why some characters are more popular in the comics than others. This popularity carries on in the movies, too. I'm pretty confident that people will always be more hyped for a new Batman movie than a new Thor, GL, PotC movie. But, sure, if there are several DC movies that do well enough to keep people busy until another director is ready to give us a fantastic Batmovie again, by all means they should go for it.
Well, when POTC first came out, it's not like people were saying...'yeah, it's good....but it ain't no Batman, that's fer sure...!' Unless we're talking Star Wars or maybe even Raiders, you're pretty much old news once something bigger and better comes along. If you want to point to what made Batman so popular, point to Nolan and his team, not so much the characters' inherent qualities vs. others and so on. 'Cuz when it comes down to it...they're ALL still just comic book characters and these are just movies. So if, say, a GL or Thor or something else is rakin' in the dough and even setting records, it's not like it'll be any less meaningful/valid by not being Supes, or Batman, or Spidey....or that they don't really have a chance by not being one of those characters. A movie based on a friggin' 40-yr-old pirate-themed amusement park ride got a big star to steal the show, and look what happened. What chance did that have based on its inherent character appeal alone until the right ingredients came together?
If they want to capitalize on Batman 'hype', then they'll probably have to continue or at least associate with the Nolan movies pretty soon because of recent success...not so much the franchise/character as a 'legacy' or what have you. Not that Batman doesn't have its own iconic appeal, and of course something like the Joker is too juicy to pass up, and so on. But it's really fair game for anyone...so even though the Batman movies are riding high right now, chances are that they'll have to earn their stripes all over again once a new series starts up after several years in between, because with so many other characters and big franchises, nobody's seat is being saved. i.e.. I doubt moviegoers would really miss Batman that much if there are other big movies out there to enjoy, especially if they feel that this Nolan trilogy has completed itself. And that's not really a bad thing aside from not making money off of Batman films...which again, could be quelled quite nicely by a different mega-hit franchise. The Superman franchise saw this with SR...it's like yeah, he returns, but there wasn't exactly a big gaping hole during his absence...except for WB, perhaps. But hey, find the next Harry Potter, and then they could just send Supes a Christmas card while he's away. Same goes for Batman or anyone else.
But bigger in the comics or not, as far as the movies go, it all depends on those two hours that people buy a ticket for. Because I have a feeling that if Hulk got Nolan and Batman got Ang Lee...we'd be looking Hulk 3, and Batman being in developmental limbo....like Superman was until recently.