I hope that future films restore the idea of secret identies. It's a core element of the appeal of many superheroes. Otherwise they are just spies and government agents.
I know the thought is that's it outdated in this time high tech surveillance. But I don't buy it. Does anyone think my real name is Donald? We all are using secret identities on some level or another. Let them be metaphors for that with superheroes.
I noticed a minor detail in The Avengers
. Towards the end a news reporter says that "Tony Stark's Iron Man Has been spotted" or something like that. Not sure if it means anything. But their could be skepticism whether he really wears the suit all the time.