Sharing/storing child porn is already illegal and punished far more harshly. So it's not like we've gone from zero to one. We've been censoring things people don't like for a little while now.
We're long past that point. Many (most?) Western governments ban simulated CP, including non-realistic stuff like cartoons or even purely textual descriptions.
Some go further still. E.g. in Australia, "laws also cover depictions of sexual acts involving people over the threshold age who are simulating or otherwise alluding to being underage, even if all those involved are of a legal age."
