I don't know if anyone on LW watches DoctorWho/Torchwood but the american Torchwood remake's first episode just came out and the premise is that everyone on earth loses the ability to die: S04 EP1 the "Day of Miracles"

Enjoy, the reason i added it to discussion was because of the whole never die concept and one of the best quotes of all time :)

"And someday when the descendants of humanity have spread from star to star, they won't tell the children about the history of Ancient Earth until they're old enough to bear it; and when they learn they'll weep to hear that such a thing as Death had ever once existed" [Harry Potter and the Methods of Rationality](http://www.fanfiction.net/s/5782108/1/Harry_Potter_and_the_Methods_of_Rationality)

-Matt