[amyrlis]

Hhmmm... I think that regardless of the loyalty of Man, the events of the First Age would have remained much the same with the Vanyar and Valar intervening and casting Morgoth into the Void. However, the events of the Third Age would have been quite different. If all the men had been corrupted, then I would imagine that, contrary to the theme in LOTR, the Age of Man would not have been approaching. The elves were waning in ME partly because of their weariness and partly because their time was coming to a close and the Age of Man was upon them. If there was to be no Age of Man, then I would think that more elves may have come from the west in search of kingdoms and adventure, as the Noldor did. So, elves would have continued to thrive. But, Sauron would have still been around, and the rings as well. In defeating Sauron and the Ring, the elves would have cast their own doom by diminishing the power of their own rings. So there lies a dilema, without Men in the picture, what would the elves have done about Sauron? Flee Middle Earth and leave it to him and his minions? Or defeat him, yet diminish their own powers enough that life in Middle Earth would no longer be desirable. That is if the Elf Kingdoms would have united against Sauron - we know how those Elf Kings can be.