okay look even if—no wait, let's clarify something, it feels like 1e OA is something beyond revising, you'd basically have to rewrite large swathes of the book, not to mention have WotC write new rules and mechanics for an edition that's no longer supported. let's take that off the table.
if we're looking at a new edition there's several things at play here: for starters WotC isn't really interested in making huge setting books anymore; Sword Coast, Wildemount, Theros, these aren't the big super detailed settings that used to make up campaign settings back in the day, and only get one book. Eberron may be an exception but it still mostly focuses on Khorvaire (it's creator is releasing another large book with more details, but it's not an official D&D product). the whole of Kara-Tur would be pretty big in scope compared to their current setting offerings so it'd be better to focus on maybe one or two specific nations. but also, we can make something entirely new that takes inspiration from Asian mythology and fantasy, we don't need to remake OA.
or they can place more detailed disclaimers talking about the issues specific books have.