I've also considered the Twilight Zone idea. Where it's just a vicious cycle.

Here's my ideas:

The new, wiser Rock Star..

The first In the Flesh? is actually the end of the story. Here's Pink still bearing the scars of his breakdown (shaven eyebrows, black uniform), but somewhat more jovial. Instead of taunting the crowd, he invites them to meet him. He has broken down the wall and invites his audience to see the real him.

The Rebirth idea

The line "isn't this where we came in?" could refer to the fact that when you tear down all the barriers and insecurities, you're back to where you were when you are born. This goes back to Roger's idea that no one is born hating people and wanting to kill. So that when you remove all of the barriers and hurtful things, you would be like a child again.