I agree that taking the subs private for 48 hours is a good first step. And I agree that subs staying private indefinitely is a good next step.
But if neither make headway, just going unmoderated is the logical next step. Yeah, reddit could take over moderating the subreddits. They can also do that if they're set private. But they don't want to. They outsourced that to volunteer moderators so they could get free labor. If they want to run their own moderation, and submit their own content, the reddit corporation can have fun with that.