Agreeing with you that security should be our main concern if there's so many flaws in the DAO.
Security should be the guarantee for a prosper DAO.
I would like to know how many whales are out there within the DAO and their sizes and also how many single little fishes. This should be public data. Then from here we might see the creation of unions, representants, etc.. And repeat many of the flaws of our current political systems we live in.
I propose to avoid it by casting random votes by number of participants. So one account equals one vote, as a security mesure and only on some votations randomly and without previous public notice.
I would like to see some more proposals to create a healthy and secure community within the DAO. I also would like to know if it is possible to get an graphic overview of the token holders percentages. I guess that this picture will help understand the real risks of the possible threats you've described.