This.
only suckers keep their coin on exchanges.
Mtgox. Bitcoinica. Mintpal. Poloniex. Cryptsy. Bitfinex. Coincheck. All hacked, all lost their users coin.
Any coin on exchanges does not belong to you. Only coin in which you and you alone hold the keys, is yours.
I hope Coinbase gives you your btc when the run starts next year or two.