"Naimark" (I can't see a real name on the site) posts about a predictions timeline s/he created for Ars Electronica in 2004. There are 500 predictions, each tied to a year over the next 25 years, and there are two lists of predictions ordered by votes. The votes only indicate how insightful, clever, funny or interesting a prediction is, so they're not as useful as votes along a single axis, but better than nothing. All good fun.
25 year prediction timeline
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