Search techniques will eventually replace many uses for tagging. Tagging documents by their topics will be replaced by IR search. Tagging pictures might be replaced by imaging technologies and techniques such as face detection. So with text and images covered by other developing technologies where will the future of tagging be?
Human tagging will be needed for problems that computers can not easily process. I see this as primarily human evaluation. Humans can make value judgments (Good/Evil, Happy/Sad, Positive/Negative) that machines are incapable of making without human guidance. Personally I see tagging being applied by people to people. I can envision people tagging other's blog pages with their own value judgments, as the primary form of tagging.
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