I tend to agree with
@Remathilis on this in that Mystara was mentioned in the 5e 2014 but appears absent from 5e 2024 (I do not have the books to 100% confirm) which indicates that Dark Sun is possibly still on the cards, once they are happy with their psionic system. I do not think its mention is merely a cash grab.
As a Mystara fan I'm happy they are leaving it alone.
The fandom produces more than enough content for me for inspiration, and doesn't worry about supposed metaphorical connections with real life. Inspiration and idea-sharing for good-storytelling is where it is at.