Recently, after reading some of the wonderful series Rising Stars I've been growing more and more attached to the idea of having a campaign where all the paranormals have a unified origin that has recently occured, making the whole concept of actual superhumans pretty new to the world. It's really neat to roleplay how the world reacts to it as a whole and how the characters can help shape the destiny of their kind. Much like the Wildcard series as well.
However, one thing that always bothered me about unified origins is that everything is so black and white. It's either part of the human condition, or part of the paranormal's. It also eliminates much of the fun to be had with giant monsters, magical beings, mythology, aliens and so forth. But I can't picture my campaign having any of those things prior to the 'event' that creates the super powered beings. I want my world to have a sense of wide eyed wonder, awe and fear when these beings appear. Plus, if things like Werewolves, Magicians and Vampires exist, then sooner or later, they'll meet up with the more prominent superbeings and be exposed to the world at large. The backlash against them would be huge and would in all likelyhood be deadly.
Also, the lack of other sources of weirdness kind of slims down the area of conflict. Most of the challenges in this world would be of metahuman quality. No demon minions, no robots going on a rampage, no nefairous sorcerors conjuring up beasts of fire and ice to conquer the world.
Any opinions on the whole idea?