To be more direct,btc will not crash due to cryptopia exchange that is hacked recently. We have seen centralize exchanges hacked in the past but btc price never respond vigorously to the hack.on the other hand,it may not be btc that is hacked on cryptopia exchange. However, the amount of coins/tokens hacked may be trivial to pose threat on the crypto market.
We should also know that cryptopia is not the largest crypto exchange in the world.So,there is high possibility that the entire  crypto market won't witnessed  huge dump due to the hack.