I realize this observation doesn't qualify as news, but once in a while this essential truism of showbiz needs to be reiterated, just to wake people up.

Today's exhibit: Seth Rogen in talks to co-write and star in "The Green Hornet."

Now let me state up front that I have been an ardent champion of Mr. Rogen, the unlikely romantic lead of "Knocked Up", ever since his debut as the congenitally sarcastic Ken Miller on "Freaks and Geeks". I...