This hackers are really hurting the crypto market. This is one of the reason why some people do not trust crypto currency. I think exchanges should really ramp up on security because if this continue more people will lose trust on crypto trading.
Definitely, its unacceptable that exchanges can afford to have loose ends on the security matter. It's not that complicated to have a secure running system, it is all about the administration team and their decisions about their exchanges, which sometimes are unfortunately the wrong decisions.
On the bright side, most exchanges have politics in place for extreme events like this or flash crashes which compensate customers. To which extent is, once again, in the hands of the exchange, but it is still a measure meant to bring back some of that lost trust. Of course, most of the exchanges won't ever have to use these compensating policies, the primary goal being security on a respectable exchange.
As an alternative, a ledger nano s is a mandatory tool for most cryptocurrency holders, permitting to store certain alt coins on top of the most popular cryptocurrencies.