What about this: Can you even IMAGINE a guy getting 2 MOHs these days? Me neither.
I second all thoughts about more MOH, less Bronze/Silver Stars. A bronze star for being good at paperwork? Sad.
Because it can't happen anymore, a change in the law in 1918 allows only single awards, it also created the 'pyramid of honor' that we still use to this day:
http://www.cmohs.org/medal/history_links/double_award_winners.htm
http://www.cmohs.com/medal/medal_history.htm