FILE In this July 27, 1953, file photo, US Maj. Gen. Blackshear M. Bryan, left, exchanges credentials with North Korean Lt. Gen. Lee Sang Cho at the opening session of the Military Armistice Commission at the Panmunjom Conference House. North Korea’s collapse has been predicted — wrongly — for decades. So it is no surprise that unconfirmed rumors that current leader Kim Jong Un is seriously ill have raised worries about what Washington and North Korea’s neighbors would do if things fall apart in any post-Kim North Korea. At Lee's right is Chinese Gen. Ting Kuo Jo, and next to him is Chinese Gen. Tsai Cheng Wen. (AP Photo, File)