My personal idea (silly but no more so than making smores at Mt. Doom) [img]smilies/wink.gif[/img] is that the Mouth of Sauron embarked on a new career in real estate, telemarketing to the folk of Gondor to get them to buy beachfront lots at the Sea of Nurnen, maybe giving out lifesize Olog-Hai lawn ornaments (stone!) and the Nine Rings as promotional prizes.
More seriously, probably nobody would want to live in Mordor for a few centuries. Aragorn tells Faramir after making him Prince of Ithilien to live in the Emyn Arnen, rather than Minas Ithil-Morgul because it will be some time before it is cleansed. Mordor did remain desolate throughout the entire 3rd Age, but that was partly because Sauron's spirit was still around.
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