We should realize that the concept of "taking granted" serves only as a convinience. While you may label me as the "Master of the Obvious" for saying that, most people dont realize that it means, on a larger scale of time, we should always be aware that there might be other possibilities. We need to preiodically research and revise of what we have taken for granted. This is way easier said than done. It is important to be critically minded to be able to search for, go after, and dig out to view things taken for granted.
BTW, This happens to be a way of "Be prepared" strategy.