I can see how manga artist and writers can use it as a tool in the future, but I don't think AI tech is nowhere near in being creative enough to create an engaging story. That might change in 5 or 15 years tho.
Here's Inio Asano use Unreal for backdrops for example. It's a tool for him, but he still has to have the skills to draw and story tell.
This is outside my knowledge but. I think we are still at the top of the hype cycle when it comes to AI.
https://en.wikipedia.org/wiki/Gartner_hype_cycle
Right now, I think everyone is talking about because it is the emerging technology and billionaires want the investment money. I think it'll make a big impact, but not as big as impact as people think it would be.
That being said, I don't know much about this stuff, so it is outside my wheelhouse.