Holy Imperium - Downfall

The 6 Millenia old Holy Imperium of Man is on it's knees, from the great and ardious bloody war with the Hyperboreans being a costly success, to the Hyperboreas constant revolt and desire to change status quo. Decades is all it took for a powderkeg to erupt. The whole of the westerm hemisphere rebelled under the West Empire, right after the Hyperboreans rebelled seeing this as opportunity. The Hyperborean Pact alliance was created between these nations, and the Empire of Asia also joined once it seceeded. Australia was released by the Holy Imperium to keep up with war attrition and over-extention so it is a neutral nation and wishes to continue to be so. Is this the fall of Roma? Will the Holy Imperium fall after 6 millenia of heritage and tradition?