In political office, a lame duck is an official who is approaching the end of his or her term, especially an official whose successor has already be elected. The god of this world. i.e, the devil (2 Corinthians 4:4) is a lame duck. His term is finite and is approaching an end. The one who is coming to reign as THE GOD of the world and the one to come is already elected of God and His name is Jesus Christ. Jesus Christ is made ruler over all, subduing all unto himself (Philippians 3:21). Jesus Christ is the destroyer of the devil (Hebrews 2:14). He destroyed the devil and power of bondage that the devil had over people. (Hebrews 2:15). Let us eagerly await for the return of Jesus Christ so that the lame duck devil will be completely removed from having any control whatsoever over the world or its people because God says that in the better covenant, that He has established through His son, He will be our God and we shall be His people (Hebrews 8:6,10,12)

Hebrews 2:14-15 (KJV)
14 Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil;
15 And deliver them who through fear of death were all their lifetime subject to bondage.