XEL
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Let's start by noting that the NWC universe hasn't disappeared. Even among international fans of Heroes and Might & Magic, it has far more fans than Ashan, and Legends of the Ancients is still very much alive.
If the explanation is incorrect, then adding new fantasy cities will also seem absurd, but if it's done correctly, it's quite easy to incorporate (especially considering the concept of the old universe), and even science fiction can be integrated easily.
And there's no "universal wisdom" in the fantasy aspect of Heroes, just as there isn't in the science fiction aspect. Universal wisdom isn't always necessary in games.
If the explanation is incorrect, then adding new fantasy cities will also seem absurd, but if it's done correctly, it's quite easy to incorporate (especially considering the concept of the old universe), and even science fiction can be integrated easily.
And there's no "universal wisdom" in the fantasy aspect of Heroes, just as there isn't in the science fiction aspect. Universal wisdom isn't always necessary in games.