Personally I think he'd release his treatise under CC-BY (which requires copyright law to work).
FWIW patents are about an exchange of knowledge for a time-limited monopoly on the use of that knowledge. Patents allow the free propagation of the ideas behind patentable inventions and provide means to incentivise inventors and to reward beneficial inventions. They also, by exclusions, all the development, experiment and investigation of others in to the content of patent disclosures before the details therein would normally be disclosed.
The alternative to patents ("open [letters]") is industrial secrets. If you can show me how making all current patent disclosures in to industrial secrets promotes the propagation of technological ideas I'd be much obliged.