How different would Korea be if the Jeonggamrok prophecy had come true?

For those who don't know, the Jeonggamrok is a compilation of prophecies written by an unknown author that appeared in the middle of the Joseon Dynasty.

The Jeonggamrok predicts the arrival of a messiah, a nobleman named Jeong Do-ryeong, also known as the "True Man," who would lead an army from an island to overthrow the Joseon Dynasty and establish the Jeong Dynasty with Gyeryongsan Mountain as the new capital of Korea. The Jeong Dynasty would establish a nearly utopian political order for 700 years, but it would not be eternally utopian. In the end, like all dynasties, it was predicted to become weak and corrupt. Other dynasties would follow (Jo, Beom, etc.).