This really does my Tits in. I work in security and have had to stop people taking pictures many times. I really hate doing it but when you have your boss screaming in your ear to stop them.. Well I just have a quite word and explain the situation.
If Apple was to stop your phone from talking pics at gigs/events I'd stop using them (and I'm a big fan of the IPhone).
Phone cameras are pretty good these days so if you are In The middle of the crowd I'd just snap away. Security will never be able to get to you/find you, just pocket the phone and deny anything if somehow you are found