Show me why other exchanges do not have this problem with withdrawals but ONLY MTGOX?
Remember MTGOX is using a custom version of the bitcoin software. This is likely the reason they have issues with their exchange platform.
Because the attack involves mining your own block, hence requires lots of hash power so is difficult to execute unless you've got stacks of hashpower. It may also be noticed by a smaller exchange when they noticed their balance is much lower than it should be. A couple hundred BTC missing from Mt Gox wouldn't go noticed, it would go noticed from cryptsy.
They will most likely try to execute this attack on other exchanges unless the devs push a fix fast which they are working on right now.