Besides saving lives by making 48 million research papers accessible to patients and doctors, Sci-Hub to me signifies that the scientific community (well, admittedly, a tiny proportion of it), is starting to lose its patience and becomes ready for more revolutionary reform options. A signal that the community starts to feel that it is running out of options for evolutionary change. To me, Sci-Hub signals that publisher behavior, collectively, over the last two decades has been such a gigantic affront to scholars that civil disobedience is a justifiable escalation. Personally, I would tend to hope that Sci-Hub (and potentially following, increasingly radical measures) would signal that time has run out and that the scientific community is now ready to shift gears and embark on a more effective strategy for infrastructure reform.
Although I realize that it’s probably wishful thinking.