I'm proud to have done something similar to this. I knew I was going to have to sign over the publication rights to my dissertation. Before I did that, I published the approved, and signed off "final draft" to the Internet Archive with an open license. (I hadn't heard of Aaron or the Guerrilla Open Access Manifesto at the time.)
Schools and academics can drop subscriptions or boycott submissions. Law can be changed.
Even if that's future-looking only, it can change the balance of interests for journal publishers.