Interesting truth about the rule of the Messiah comes forth in what seems an unlikely passage. In the middle of a section about the judgment befalling gentile Moab, a messianic reality is proclaimed. The only hope for Moab will be submission to the rule of the Messiah. The One Who will sit in faithfulness in the tent of David will be the One Whose steadfast love will judge and seek justice and righteousness for all the nations.
The rule of the Messiah bears out all the promises God made... especially those of the Abrahamic covenant. He will bless all the nations just as God foretold to the childless old nomad so many millennia ago under a starry desert night sky. The prophet Isaiah fully expects that the only hope for the remnant of the Moabites will be the rule of the Messiah. Clearly the entire world will be a different place when He reigns.
So you cannot really make the charge that the Old Testament view of God is of a regional deity worshiped by the Jews alone. The affect of God's redemptive plan is global. And the stern oracles of the prophets echo back this glorious hope in a clear vision of a world ruled in peace and justice from David's throne.
From the moment of the first sin in the garden of Eden, God has both judged sin and sought the restoration of the world of humanity. Our history is a redemptive history. And that will be visibly demonstrated globally when king Jesus shall reign from David's throne.