Why no superheroes/faultiness of Iron Man movie plot lines

As of today, no superheroes exist, but needless to say I do believe they are in hiding waiting for the right moment. Why? Because with the current media a superheroes secret idenity would be found out in a day. Then the superhero would be caught and tested on. No I don't think that sounds to great for superheroes. 

On other matters I find that marvel needs to find a new idea for Iron Man 3. I know that would cut back production of the movie but seriously they need to come up with a new plot line. If you think this plot line is new you are sadly mistaken. Okay so in the first Iron Man, Iron Man builds a suit, someone steals the blueprints, builds his own suit and tries to kill Iron Man. Iron Man 2: Someone steals the blueprints, builds his own suit, tries to kill Iron Man. from the new trailer Iron man 3 will go something like this: Someone steals the blueprints, builds his own suit, tries to kill Iron man................ Okay so I don't know how to be concerned about this, We are either completely stupid for not seeing this right away or the maker of Iron Man needs to think up a villain without a iron man suit. I can think up a good plot line, An angry worker at Stark labs seeks revenge, gets shocked so badly it should have killed him, has the ability to control electricity, Shuts down Tony Starks suit with a power surge, and tries to kill Iron Man. Boom! I just thought up a better plot line for Iron Man 3 and it only took me five minutes! if I can say so my self "Joshua Welling for the win!"