Wellllll, there just happens to be a rather mah-velous RPG happening right now where the next great evil to hit Middle Earth is the Blue Wizards! (Shameless plug).
Seriously though, I would suppose that there will not be Evil Incarnate arising in Middle Earth again but "wars and rumors of wars", as Man strives for dominion over each other.
This kind of thing was happening even back to the Second Age of Middle Earth, and is bound to happen again. And if you ask the common folk of M-E if they would rather be killed by the Dark Lord, or some power-mad Kingling in the Fourth Age, I'm sure they be hard pressed to understand the difference.
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