For the record, they already did a story about Clark writing a book. Anyone remember Under a Yellow Sun? It was a one shot graphic novel. Not bad from what I remember. Nothing amazing but a good story.
It always puts me off when a writer says the secret identity is "silly" or a "lie". It shows a fundamental misunderstanding of Superman and why the secret identity was created. Yes, the identity lets him live a normal life. There's a lot more to it than that and living a normal life is just part of it. It's one of the most important aspects of Superman that his creators put into the character. It's about the experience of being a Jewish immigrant and having to hide that to avoid discrimination and hatred. If anything, the secret identity is more relevant now than it has been in decades. Remember "you will look like one of them but you will not be one of them"? It's why we know Stan Lee as Stan Lee and not Stan Lieber or Jack Kirby instead of Jacob Kurtzberg. So saying that the identity isn't relevant or taking at face value and saying people would figure it out misses the point entirely. It's not meant to be believable, it's a metaphor for the experience of a lot of immigrants. Besides, this is a story about a flying man from outer space who fights crime and aliens while wearing a blue bodysuit and red cape. "Realism" went out the door with the very concept and that's ok.