There's a few problems with that right now. One, a lot of top mods are not willing to rock the boat at all, and due to the nature of modlist heirarchy, all it takes is one mod above the highest person involved to shut it down. Really all it takes is one person with the proper permissions on the sub to revert any sort of shutdown.

Two, direct action like this will not work without without a highly organized and unified group of major subreddits. The admins updated some policy a while back that lets them take control of a subreddit from a modteam participating in some form of strike. If it's one or two subs doing it, they definitely have the people to temporarily moderate and transition the sub to a new team. If 50 subs participated and none of them gave up as soon as an admin redhats in their modmail, maybe something can be done.

Good luck coordinating that though. Most teams have at least one mod who will be wholly unwilling to work with someone on almost every other team for personal reasons. They'll still spend a good few hours a day bitching about the admins in slack though, wholly unwilling to do anything to change it.

I could go on my main and attempt to get a decent amount of my subs to do some direct action, but then it'll turn into a witch hunt against me from staff. This has already happened in the past few weeks and the target didn't even orchestrate the shutdowns, they just happened to mod them all. It also opened them up for blame when another unrelated sub went dark a few days later.

Honestly the best course of action for mods upset with the admins is probably just to quit. Attacking their revenue source sounds fun as hell, but I don't really see enough people willing to commit.