I don't like the "closing challenges" thing because there are few challenges as of now (and look the distance between them).
Maybe only the "not that short" submissions could be shown (like, hide only the top N to keep competitive). I'd use N=3, 5 or 10.
I take it I won't be able to update my own submission in a particular challenge after I've looked at others, but I really can't cut down my (as far as my knowledge takes me) 'X bottles of beer on a wall' script; I'm stuck at 306 bytes and dying to know how it was done in 170 or so.