Hackers are an issues and a negative for crypto, and for that people should keep their money off their exchange. The potential issue that I might see with people new cryptos is that they might find it more convenient to leave their coins on exchanges, rather downloading and installing a wallet, block chain etc. Thinking it's not going to happen to them.
On top of that, if they are the type that will find it inconvinient, then they're probably the type who don't do things like backing up their files, and things that computer savvy people do.