A large segment of the population (of Western audiences especially) does not view any animation as "dramatic entertainment". Animation is considered to be for kids. So Hollywood is looking at it and going "this is a great story, and it would require very little adaptation to localize it to a Western location and to make it as live action with a little bit of special effects". They see dollar signs, and they may be correct.
YEAH! Amen, bruddah!
One Punch Man is not just a sendup of superhero stereotypes, it's satire of the entire shonen genre. It's taking a lot of the shonen tropes and turning them on their head.
There's a difference between being a
satire and just being what you claim to be
satirizing. OPM is the latter, and any amount of winking at the audience of "Isn't it silly that this cyborg guy is spending an entire page talking about his history?" doesn't change that.
Like that Deadpool Xbox 360 game a few years ago. It was HILARIOUS, but it claimed to be a satire of games like Devil May Cry and God of War
when it was exactly like those games. A satire has to expose the faults of something, not just BE those faults with a few fourth-wall jokes about how silly it all is.
I'm not an intense fan of MHA - I can't remember any of the character's names aside from All Might, Deku, and Froppy 'cause she's adorable - but it is a
straight satire, if such a thing exists. Yes, it is a superhero comic with all the things that that implies, but it also takes a look at the tropes and deconstructs them, thinking carefully about how they actually work WITHOUT forcing down your throat dozens of pages of exposition or grimdark bullshit or "winkwink, isn't this silly?"
Don't get me wrong. I don't HATE OPM, but I don't like it either, aside from that glorious 16 double pages of a single punch! I'm neutral on it.