The Divine Dynasty Method was not a complete failure in kingdoms and empires. In fact, it had been successfully established in the first real imperial dynasty - the Da Xia Dynasty.
However, the price the Da Xia Dynasty was forced to pay to realize the Divine Dynasty was overwhelmingly high. So high, in fact, that the dynasty they had constructed couldn't withstand the strain. With their foundation left heavily damaged, countless formidable figures were sacrificed and the Divine Dynasty was on the verge of collapsing.
To make the Da Xia Dynasty eternal, the last ruler of the dynasty chose to resort to sacrificial methods, mercilessly spilling the blood of foreign tribes and even of the human race.
Such brutal methods were essentially a violation of norms, thus triggering a resistance from countless forces who naturally did not wish to end up as sacrificial lambs.
