Alright, if you have played The Elder Scrolls then chances are you know of the Dwemer, a race of men in mountains who essentially all disappeared in their steampunk phase while literally everything else was beating each other with big clubs, they were an impressive bunch. But that's not what I'm here to cover today, instead I have a theory.
Did the Dwemer just Zero-Sum?
Zero-Summing is what happens when you try to attain Godhood but fail to keep your individual personality, through a means called Chim. Both Vivec and Talos achieved Chim, and Talos became a recognized god, not too sure about the Elf. Perhaps the Dwemer tried to undergo Chim, failed and straight up ceased to exist?
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I feel like that would effect all plains, so the one who survived by being in another plane sorta ends your theory for me. I still believe the popular, taken to another plain of Oblivion theory. One we don't know about.