In 1893, a group of esteemed thinkers produced a collection of predictions about what life would be like 100 years into the future (1993). You can read the results of their prognostications in a book titled Today Then. As you might expect, these prognosticators had a lot to say about the importance of railroads in the future... and not much to say about this new thing called an automobile. I offer this as just one example of how long-term predictions are most useful as an exercise in humor.
On that note, for those who are interested in future-stuff and making predictions, you might want to check out a little article I wrote titled There Are No Facts About The Future, available on everyone's favorite defense technology magazine.