In the the future we will not have new technology because nuclear war is on the horizon. Many dangerous country's including North Korea and Iran have nuclear weapons. lets say we make 1 of the 13 country's that have nuclear weapons mad.  Next thing your know the world is leveled and the only people who survive are people who went underground or people who survived by pure luck. Then since the earth is covered with radiation all kinds of new creatures pop up like mutated spider or animals with two heads. Then the doomsday preppers will have to repopulate the earth and that will be very difficult because of limited genetic material between humans.