... That's not a trigger warning, IMO. That's designed for what few parents that give a crap what their kids play to decide if the game they're buying is appropriate.
It's not really any different than the ratings movies get, or even TV shows that often tell people before it starts what might appear, or TV show ratings.
This has been around for ages!
I'd say, yeah, we could do to keep it. The ESRB was something of a huge compromise made back when Jack Thompson was doing his thing, and videogames seemed to be getting more and more graphic ala Mortal Kombat.
Not all games wear their content on their game cover sleeves. Yeah, anyone over maybe the age of 10 knows Mortal Kombat is filled with bloody, gorey violence, but does the cover convey that? Not really, IMO. It's not like Netherrealms only makes Mortal Kombat, they did Injustice which was nowhere near as bloody, and violent, so it's not like companies can get sorted by the content of their games.
I mean Capcom makes Street Fighter, and Monster Hunter. 2 wildly different games from one another.
Honestly, I don't see much point in removing the rating systems, aside from it blocking some movies from coming to theaters, like the one Rob Zombie is working on, and preventing ... wait, we did have a Leisure Suit Larry game come out... many of them. And porn games. I mean, an unrated, mass produced porn game that has a vague cover sleeve on the shelves of stores everywhere would cause considerable chaos.
I dunno, I don't see the ESRB as a bad thing. Not really a good thing either, but it's not something I want to see gone. Nor Pegi, or what other systems are out there for indicating God of War might have exposed boobs, or Red Dead Redemption having a vague vajayjay shot, or what have you.