Are you concerned at all about the precedent this sets? The Top 20 Witnesses can take away your stake if they choose to. That is something that steem will carry with it forever gong forward. It looks a lot like a move by the top witnesses to ensure they remain as the top witnesses going forward. If this was truly a play to protect steem (and not to financially benefit themselves), all of the Top 20 Witnesses should step down indefinitely.