What do you think about it? Everything can be hacked?
Everything can be hacked. It is just a matter of time and effort used to attack it.
As long as there vulnerabilities which can be found, there also will be black hats who are trying to find an exploit them.
ATM's (whether crypto or fiat) always has been a lucrative goal. These are basically money storing machines.
And is it only the matter of time when we see the news that XYZ hardware wallet has been hacked or sth like that?
Probably yes. I am sure that there are a lot of vulnerabilities in all wallets which just havn't been found yet.
The good thing about hardware wallets is that an attacker would need the device AND a vulnerability + exploit to steal funds.
Thats a big advantage compared to a desktop-/mobile- or web wallet, where a simple malware would be enough to steal your funds.