Technological changes can provide good examples. Many people keep saying things like "Five more years and printed books will be obsolete," because they don't see any advantages of printed books over e-books. But it doesn't happen because there are a good number of advantages to the printed books, which remain even when people do not explicitly notice them. On the other hand, given a long enough time, the transition people expect will in fact happen, because alternative solutions to the issues will ultimately be found.

I could mention a number of advantages, but just one for illustration: when you read a printed book, the fact that you are physically aware of where you are in the book, e.g. two thirds of the way through, helps you remember the book.