Yeah, if they were going to be remade, I kind of fall on the side of cleaving closer to historical and cultural accuracy not being a great approach. Western European fantasy is viewed through the lens of decades of self-facing inspiration, regurgitation, reinvention in reaction to the above, homage in defiance of reinvention, and so on. There's very little that actually resembles historical or cultural Europe remaining in it with exception to specific works that deliberately pull from it to stand out (e.g. ASoIaF). Maztica: Now with Historical Accuracy would stand out just as much as Kara-Tur: I Watched a Kurosawa Film Once would.
Of course there's always the risk of going to far in the other direction: making a wild, "exotic" land that not only bears no real resemblance to the inspiring culture, but also no real commonality with the rest of the Realms(which is part of the existing problem in the first place. You'd end up with something that is possibly creative, but at odds with every goal one might have when trying to handle a real world culture with respect in a fictional setting.
Personally, I think what is missing is the Tolkien for these cultures. Someone who goes through all of the relevant mythology and history, then draws inspiration from that to create their own mythology and history that develops into a compelling piece of fiction. Not just a game setting, but actual literature. If Tolkien had just taken all the work he did creating fictional races, cultures and languages, and then just compiled them into a collection titled "Imagine Yourself Here," it would have been tossed in the bins of time, and the fantasy genre would likely not be recognizable to us today.