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Blizzard didn't invent anything new either; they simply expanded upon Warcraft 3, following the principle of "more of the same," and created the world of Warcraft! Did it turn out badly? The hype exceeded all expectations! The same story with Heroes 2 in relation to Heroes 3... The principle is the same, but the effect is grand! In general, I don't see anything wrong with that, especially since what's being created is not a technical platform with a set of tools, but an ADDITION to Heroes 3 (and In the Wake of Gods as well).
Sincerely...
P.S.: And yet, I eagerly await In the Wake of Gods 3.59!