I'm not at all sure corporations will rush out to use AI-generated artwork, as they ultimately won't have the capacity to do with it what they want. Why would anyone use AI art for anything identified with a brand (or frankly, anything with any specificity) when they can't control the use of that imagery? Anyone can then use that same image, modify it however they want, and sell it. There's no point to using it--you can't do licensing and you can't sell it in stores fast enough before knock-offs are generated, you can't develop and own looks or styles or characters or... It's just not viable.
Could there be children's books with AI art? Self-publishers and companies that produce public-domain stories with public-domain art might try, but why bother when anyone can reproduce it and sell it themselves (at least as I understand it right now)? Those sales are very very low hanging fruit... I'd think it could only be a novelty for the same reason those kinds of works aren't mainstream and taking over the market today.
The plethora of public domain artwork available for free already is not really a viable corporate resource...
At this point, it feels like AI art is sorta the Crown Books of art resources.