Why do you assume this?  From what I've seen the bid sum on Gox has dropped massively over the last few days.  This tells me people are reluctant to buy (obviously).  But where is that money going?  It certainly isn't being withdrawn (we all know about the huge fiat withdrawal delays).  So it's sitting in people's Gox accounts. 

So what happens when/if bitcoin withdrawals are restarted?  People who want to get their money out will buy bitcoin, send their coins elsewhere and sell them - just as they've been trying to do for the last few months.  People with low ask orders will cancel them now that they know they can send their coins elsewhere and get more money for them.  This causes the Gox price to skyrocket and prices elsewhere to (maybe) drop moderately.  And we end up right back where we were before this whole malleability mess - with a Gox price higher than everywhere else.