People are severely underrating HxH or rather it's too early to say. Acnologia could be destroyed easily by the creatures there; just the huge scaling of the Dark Continent makes it very formidable.
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I feel that Dark Continent is more along the lines of the gourmet world in Toriko. It may or may not be as threatening but I'm pretty confident that it'll sky-rocket HxH verse in terms of power. Meruem is already fodder compared to the creatures that lurk in the Dark Continent...so yeah it has a lot of growing room.
I think it'd be better to take HxH out and replace with YYH instead. It's more fair tbh.