He had enough different aspects of fate stacked against him that ultimately he had no possibility of success...
Dagoth Ur had the Heart of Lorkhan, the Kragnec tools, the power of a God and arguably most importantly Akulakhan, the second Numidian, he had an army of mindless followers a group of incredibly powerful Sixth house members all linked to the heart in a lesser extent then he himself was (at least I assume so) and a disease that slowly spread out turning everybody that could fight against him into mindless drooling idiots...
Unless some Aedra or Daedra would intervene directly I don't see how he could possibly lose, and even then I wouldn't be sure. Almalexia and Sotha Sil together did once beat Mehrunes Dagon. Dagoth Ur might very well have been capable of doing the same.
Unless some Aedra or Daedra would intervene directly I don't see how he could possibly lose, and even then I wouldn't be sure. Almalexia and Sotha Sil together did once beat Mehrunes Dagon. Dagoth Ur might very well have been capable of doing the same.
Essentially, Dagoth, like the Dwemer, managed to thoroughly anger... just about everyone. He had Talos/the Empire, Shor, Azura, and CHIM-ascending Vehk/the Tribunal (basically every power that intervenes on the mortal plane on a regular basis) conspiring to overthrow him. Plus a prophecy that his doom was sealed in the future, which he was well aware of... the entire time. The Nerevarine is basically the artificial construct of a UN Convention worth of separate powers united to overthrow a single leader.
All that said, they referred to it as the divine disease for a reason. It had debilitating effects on some, but brought others into a higher state that can easily be associated anologously with 9th Era http://www.imperial-library.info/content/kinmune, for example: "a dreamsleevishell... able to stream several live-wire mortal proxies at once... her mind an aggregate of the residual personalities of her last several users."
Basically, it was an experiment in futuristic CHIM-like collective consciousness, using transmissions through dreams, and through methods vaguely described in the http://www.imperial-library.info/content/morrowind-poison-song.