Valid points, but I don't think that Tom is 100% immune to the common dark side of a person or the issues of M-e. Sure, the Ring had no meaning to him and nothing happened when he put it on- he is not of Middle-earth, yes. But, living in Middle-earth, he would eventually be subject to the same fate as everyone else. If Sauron did cover the world in a second darkness, Bombadil's perfect lifestyle would certainly be affected, and even Tom wouldn't be able to really defend his keep. He would be consumed like the rest, residing in Middle-earth.
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"Loud and clear it sounds in the valleys of the hills...and then let all the foes of Gondor flee!" -Boromir, The Fellowship of the Ring
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