The award for the most overlooked sign of the end times would have to go to the gospel being preached to all nations. There is nothing earth shaking or shocking about believers going from region to region spreading the good news, however, the current age can not conclude until the last city is visited, the last tract is handed out, and the last altar call is finally made.
“And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come.” (Mat 24:14)