Not a bad idea, actually. Ofcours, for me The Truman Show will Always be connected with Jim Carrey ... but a TV-show based on the same idea? I'm not against it. With the right writers, they could make something great out of this.
And comes down to the right casting. For a role like this, I believe in John Krasinski. (The Office US) Cause he has similar qualities compared with Jim. Funny, able to hit you when more serious, extremely likeable and most of all ... he can play different ages of himself.
PS: Don't know in what section this belongs. Be free to move it.