Playings devil's advocate: There are many ways to incentivise even complex, large scale investment absent copyright. From project finance to Kickstarter, it is well beyond self-evident. On the flip-side, the cost of supressing academic and sciendific knowledge through academic publishers dwarfs whatever entertainment value might come from their library (~12 films)[1]. I think your comments on this are too simplistic.

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[1] Toy Story, Toy Story 2, Toy Story 3; Monsters, Inc.; Finding Nemo; The Incredibles; Ratatouille; WALL-E; Brave; A Bug's Life; Cars, Cars 2