Who said banks were never hacked? It is only the way for the public, to be forced into using printed money and trust banks with their funds. Also, hacked exchanges doesn't mean that the cryptocurrency is vulnerable, it just means that the exchange was lax on security, the public doesn't understand. If you are serious about your funds, keep them in an actual digital wallet, fortify your OS, and you should -hypothetically- never lose them.

I think it'll take longer for people to adapt to cryptos, especially after the last fall in price.