Would Canon Celestia and the Mane 6 countenance the Conversion Bureaus and Ponification? In the face of a megadisaster that would sweep humanity from the face of the Earth, I think they would. If only as the lesser of two enormous evils. Our world is out to get us, and only Celestia and the Mane 6 can save Humanity.
A meeting of the group as they put the plan together, and as their worst fears come to fruition.
Author's Note: I don't know if I will continue this. But I encourage others to examine the ideas and play in the sandbox.
A good story should provoke discussion, debate, argument...and the occasional bar fight.J. Michael Straczynski