The bottom line (based on projects that attempted to revive the old universe).

The problem is that the Old World has been phased out. Although, to be honest, Enroth (the heroic setting) was already pure fantasy. There were attempts, of course, but the Heroes fanbase didn't allow Forge to be introduced. The Old World faded away in "Armageddon's Blade."

But yes, I agree. Even if we can't revive it, maybe we can at least resuscitate it. Try, at least. There are fans, after all. Probably.