'The last enemy that is being abolished is death.'
And the final enemy that is being defeated is death. Once God's throne is established, and the resurrection has taken place, there will be no more death. It will have ceased. It will have been abolished. Thus the last enemy is being destroyed by the resurrection (compare the similar idea, although expressed differently in Revelation 20:11-15), and this being so all His other enemies must be defeated at His coming and at the resurrection.
When Adam sinned, death received its power, and it has reigned through the ages. It was Isaiah who declared that one day death would be swallowed up for ever (Isaiah 25:8) and followed it by speaking of a resurrection of bodies (Isaiah 26:19), and Hosea spoke of its conquest (Hosea 13:14). Now that hope will come to reality. Death will be destroyed by the resurrection to eternal life. And with it will be brought to nothing him who had the power of death, the Devil (Hebrews 2:14). That will be the end of all things, and the beginning of all things new.
Those who believe only in the spirit living on and the body remaining in the grave to end in nothingness, fail to look to this glorious hope and this final triumph of God. They see only the continual cycle of existence. But the glory of the Gospel is that one day God will bring to a final end all sin, all suffering and all rebellion, and all death and will rule over all. For just as all had a beginning, so all will have an end.