the problem with "you have no idea what we have in store" is that the internet is SCARY smart. They most definitely DO know what you have in mind. All the twists and turns you have in mind are going to be met with "okay...and?". Don't try to be cute, try to tell a good story.
this
And yes other guy guy, the reason for this theory is that everyone is now inexplicably weak compared to there backstory, or even has mismatching biology (vampire), and how scary fast people can be "turned"