lol this thread is ridiculous. If bitcoin went to 1 mill it wouldn't happen overnight, if it was really starting to take off upwards past $1k again everyone would be focusing on their own security, beauty being they CAN control the private keys not an exchange. Also by this point most of the current amateur exchanges would be long gone and proffesional platforms would be up and mainstream with insurance on the coins. Also security techniques are  getting better, new ways to store coins like hardware wallets will continue to be developed.

Plus BitShares have already created a decentralized exchange, a glimpse of the future!