Here is a great article about how technology changes, and focusing on what's best for humanity (e.g. what will work?) rather than preserving the old or current way of doing things, and the role of experimenting with new things: http://www.shirky.com/weblog/2009/03/newspapers-and-thinking-the-unthinkable/

A few years ago I discovered the phrase: “how to think an impossible thought”, for myself. It’s a interesting view on perspectives 👌