There's lots mixed up with IP laws. Are talking inventions (patents) or works of art (books, movies, music, games)

I certainly know that most games and movies wouldn't exist without a monetary incentive. They take too much work to make. There are exceptions. You can make pong in a few hours and you can shoot a movie of yourself talking. You can also do both as a hobby a few hours a night. But, most movies require sets, costumes, props, and lots of other equipment and labor. Most games also require many person years of work. It's unlikely people would put in that much work if they couldn't make a living from it as it allows them to do it full time so they actually have the time needed.

OTOH, music "can" take a few hours and so could be done more easily as a hobby so while not all forms of music would continue I suspect we'd still get tons of it with without monetary incentives.. Books, it depends on the type of book. People write blogs for free and compile them into a book.