One thing that simply must be understood about dispensationalism is that the foundation is the glory of God. The essence of dispensational theology is that all of history, and the dispensations in particular, exists for the glory of God. It is part of God’s nature that He must gain glory for Himself (John 12:28, 13:32). Man always fails. God always wins. Christ will be glorified.
This includes salvation history, so that the salvation of humans is not the chief end, but it in and of itself glorifies God. “To the normative dispensationalist, the soteriological, or saving, program of God is not the only program but one of the means God is using in the total program of glorifying Himself.” (Charles Ryrie, Dispensationalism, 2nd ed., p. 48).
It is God’s ultimate purpose that all nations glorify Him (Ps. 86:9). In particular, Israel exists for the glory of God (Ps. 22:23), and is often referred to as the “people of God.” Thus, to replace Israel with the church (replacement theology, also called supersessionism), as some theologies do, is to diminish the glory God will receive by rehabilitating Israel in the last days.
With that in mind, the 1000 year reign of Christ is for His glory, something the opponents of the theology rarely understand. Christ's literal earthly reign will glorify Him tremendously, because the earth will be healed (Is. 11), all men will obey Christ, and no crime or war will be allowed. Only Christ can do this. The previous kings and rulers and presidents have all failed in their quest to stamp out crime and have world-wide peace. Even Trump promised peace but is now in a war (a necessary one). Christ will be glorified!