So in your hypothetical: you write the book and have a change of heart, I'll just copy it verbatim, slap my name on it and now I'm the author.
I think there is confusion between copyright and other things around it.
For example if I buy a physical book, I own it. I'm free to sell it or give it away. Things like the DMCA and the switch from an ownership model to a rental model are more the problem.
ie does getting rid of copyright enable right to repair? Does getting rid of copyright suddenly stop a games company pulling software from your library that you 'bought'?
Wouldn't these companies just put all the restrictions directly into the purchase agreement?
Isn't the way to focus on creating consumer protection rights, rather than just leaving it to people with the best legal department and deepest pockets to control the rules?