I don't think it necessarily has to "stop" so much as slow down. There really are too many violent games out there. Calling the violence "mature" or getting to the point where we're fetishizing it is the part that absolutely needs to stop. People have been doing this since Mortal Kombat and it has given players a really skewed understanding of what maturity is.
It's a bit hypocritical to say this because I do play a lot of violent games, and will even say that the violence can contribute to these games. For example, Dead Rising should be violent because it's spoofing a zombie movie. It's funny in that game because of the disconnect between crazy zombie killing antics in gameplay and the more serious tone of the story. That's why I don't think it should disappear.
But I see people who refuse to play any games that aren't full of blood and gore, like there's some stigma against an E-rating if you're over a certain age because it's "kiddie." It's gotten ridiculous.