How does this doom subscription journals? I mean it would be nice but realistically it just means they move to exploit the university subscriptions since the professors can't admit use of illegally obtained copies. They can further exploit the authors since many journals require payment from the author for submission and some journals charge in the hundreds. One might say "just publish to a different journal" but it's not that easy. Because of the heavy reliance on Impact Factor in scientific publishing, it is the journals with those high impact factors that the authors will try to publish to. Regardless of whether or not they are being pirated.

This is sad to say, but in reality I think this isn't going to massively impact things for the publishers. Academia at its core is where the problem lies. Sure paid subscriptions are a big part of things, but it's the stuff most don't realize (the authorship fees and institution sub fees) that give the publishers power.