How about if say, Harvard, Stanford, MIT & Caltech made a pronouncement that from now none of their academics should submit research for publication in journal X on the grounds that journal X lacks commitment to being a scientific journal and it would diminish their reputations as academic institutions to have any association with that journal. Then canceled their libraries subscriptions to that journal in public, demanded a full refund and generally made a fuss in the newspapers. The NYT would print the fuss.
I think that would change the dynamic of Scientific Journals pretty quickly. Pick one of the worst, get the evidence together, ring your opposite number at a couple of places that have similar numbers of nobel prize winners and go right at the rubbish journals with the wrecking ball having the reputation of being a place where the world's best research is being conducted.