Curry was able to get so many of his faction elected into City Council that he's guaranteed nearly all the votes he needs to thwart this, and potentially get the JEA sale through as well. The School Board's position is popular but the rollout has been so poor that it would be a tough sell even without this level of opposition from the Curry wing.
This seems like an extremely obvious campaign: when school begins soon, snap photos of all the maintenance problems and send them to the Mayor & City Council asking when they're going to fix the problems, copying the local media. Make a hashtag in social media to collect the photos, get the teachers, highschool aged kids involved, parents of elementary kids, etc.
Seems like such a gigantic vulnerability for COJ: they don't want to be blamed for DCPS's problems, but they're owning them by denying DCPS a chance to correct them.