Those who argue for a realized kingdom generally string together a number of verses pulled severely out of context. If the kingdom had finally come, we ought to see paragraph after paragraph, chapter after chapter, of triumphant jubilation in the spirit of Rev. 19:1–9. 

Paul condemned a realized resurrection (2 Tim. 2:18) and a realized day of the Lord (2 Thess. 2:2), it would stand to reason that he would condemn a realized kingdom (1 Cor. 4:8). -John P. Harrigan