Not sure if he has the power to, and if everyone else will let him, but some EOs opening up the copyright system would be very welcome. There are already some things he's done around this:
After all, the main people hurt would be Hollywood, which is run by people supporting the Democrats. And it would be popular with many voters (not an issue for Trump but it is for Republicans).
Probably no need. Elon Musk already did that. And one of his companies just published a shiny new version of grok. I wonder where they get their training material. I'm sure it's all just tweets and no stashes of ebooks or other material got downloaded in some way or otherwise fell of the proverbial wagon.
Historically, copyright cases fell in favor of big media corporations based on the notion that they were very rich and powerful and could fight things endlessly, bribe/lobby politicians, and cause laws to be changed (e.g. the DMCA).
However, AI companies are wealthier still. Some have revenues exceeding the GDPs of most countries. Surely, rich enough to outright buy out some of these media companies. At which point it would stop being copyright infringement because they'd own the copyrights. I'm sure some other arrangement will be found that is less mutually disruptive than a lot of court cases. Both sides are making too much money for anything else to happen. Forget about small book publishers making much of a difference here.
