If you think about it, speculative evolution is basically going 'what if' with the history of life on Earth-essentially, creating EUs of World One. It's literally fanfiction of life on Earth (And sometimes beyond) itself.

Plus, most of the monsters from other media are definitely Suefluenced.

First off, having two or three agents enact extinction events across the entire planet? That raises too many logical conundrums in my mind. What if they miss something? Where would the PPC put an entire noncanonical species? Why wouldn't the agents do the sensible thing and just have this obviously AU Earth destroyed?

That brings me to my second point. Having this be "fanfiction" of World One makes me a bit uncomfortable. World One really should not be involved in the doings of the PPC (beyond the various agent-delivering plot holes). It has no plot to be protected. Also, like Huinesoron said, "fanfic" of World One is typically considered original fiction. As much as it might gall us, we don't touch original fiction.

Finally, I should note that there is no story to mock. You're essentially asking to spork Wiki pages. I'm not saying it couldn't be done, but I do question both why it should be done and if the end result would be any good.