If you want to take the concept seriously, I recommend you see about finding old encyclopedias and old books predicting the future. Look at what they believed was "inevitable", look at how badly those predictions turned out. This will hopefully counteract the tendency the imagine the future by simply doing a first order extrapolation of present trends (Hi Michaelos).

This is, of course, assuming the goal is actually to make predictions that will at least resemble the future.

I worry this will end up with the same problems as dystopian/utopian fiction and just show the authors biases about the present day projected into the future. (Scott wrote about this on his old blog)

Orions Arm is sortof like this

Should posting articles based on obvious edits of existing articles (including notes indicating such) be encouraged, or discouraged? As an example, I had written up a rewrite of the Same-sex marriage in the United States article as 'Polymarriage in the United States', moved all dates forward 50 years, changed some of the case names... and then I realized I couldn't really tell if it was what snarles had in mind, or if he wanted more originality.

Shall the homepage logo be DON'T PANIC?

I assume average Wikipedia articles with lots of [citation needed] will do.