Career going downhill?

I suspect there's a slow decline, not fully visible to observers at the time but visible in retrospect. A similar thing can be observed in the careers of Warren Beatty and Robert Redford. They kept being in movies, and they were decent movies on the most part which made money, but their status did not hold up.

At the time of the Bourne Supremacy I knew Damon as one of the top stars of the moment. Now he's hit and miss. Elysium and We Bough A Zoo were advertised because of his name, then were largely not spoken of again. I think both him and Brad Pitt are going downhill. As they're getting older, they've lost momentum. Where Damon could do a Blockbuster and then have people speculating on 'what next' and follow it up with an interesting more dramatic performance, I feel there's now less chatter about him. He's tried his hand at the dramatic performance and has had some success but then he's reverting back to Bourne. There isn't real growth, he's doing his dramatic performances and then he's phoning it in to make money, but his blockbusters don't feel as big as they once were and his dramatic performances recently haven't approached the greatness of Good Will Hunting, The Talented Mr. Ripley or The Departed. He won't go hungry, but I think over time we will see him be supplanted by younger actors like Ryan Gosling, Adam Driver, Andrew Garfield and Oscar Isaac to name a few.