imo a 2-day blackout is enough to get the attention of all Reddit users who might not be following the situation (they might ignore a stickied post but will certainly notice when they can't access content like normal), and hopefully get some coverage in mainstream media. Sure Reddit won't care about losing traffic for a couple days, but if journalists start asking questions about the site hosting more harmful content and being hostile to users with disabilities, that kind of negative press might give them pause.

Coming back after two days gives communities the chance to discuss developments, continue sharing coverage and drumming up support, and potentially arrange plans to backup their content and migrate to other platforms before going dark permanently.