"sooner or later", why not, but will it be on our living ? Because most of these laws are more than a century old, and still no court effectively decided against them. The better that happen is that, time to time, a court claim that "this" is at the limit of the law and, like no one was able to clearly prove that it was illegal/forbidden, then it is not. In fact it's even the opposite, and there's part of the western world where the tendency is to search all possible way to enforce the law, including depiction in what is illegal.
I also have concern regarding the lack of objective offense making a criminal law going against the constitution. One good counter example is homosexuality. Where's the offense, objective or not ? Nowhere. Still it's a crime in 38 over the 194 countries, while for 33 of them, it's legal since less than 20 years. This mean that 20 years ago, around one third of the countries saw homosexuality as a crime. A crime without offense and not countered by the constitution. The most known of them is both a western country, a modern country, and a country relying much on its constitution ; hello USA.
You also forget that illegality isn't only a question of criminal laws, but also of civil laws. It's not said "illegal", just "forbidden", but the result is the same. If you decide to goes against the forbidding, you'll have to face the law.
When Patreon started its ban, I did some search regarding laws around the world on these subjects. I don't remember all cases precisely but, mostly, half of the time when the act is illegal, the depiction was at least forbidden. And for Steam, it will change nothing that it is a mater of criminal laws or civil ones. Whatever it's illegal or just forbidden, they'll have to remove the game.