can continue to use unblocked proxies until we block them all. ( Blocking *all* proxies is nigh on impossible because computers get comprimised daily... So new "open proxies" are created daily.)
Maybe it would if we could hook someone like http://www.1freeproxy.com/feed/atom/ (rss feed for just proxies) in so that they are automatically blocked, which i believe is Wikipedia's policy anyway.