You may be right, Squatter of Amon Rudh. Without a direct quote I'd say that it is between "natural process" and "the rings did it." Though either way, the rings did it.
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Of course it's still possible that this is a case of the sword outwearing its sheath, but there's no indication of a time-scale. They were also using their Rings regularly, and for greater things than achieving invisibility for short periods, probably hastening their collapse into thraldom.
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Their rings certainly sped the process up, yes, but as I said above, they may not be the only cause.