content: Nope, it's the old horse analogy. We used to have tons of horses, everyone needed a horse, horses basically worked a lot to provide us the energy utilization we needed. Then someone invented the automobile. Suddenly horses were all scared of losing their jobs, and they did...but not all of them.  The horses that are still alive today, though, have generally easier lives than their predecessors.  Had the other horses had had opposable thumbs I'm sure a bunch of them would have become mechanics, but basically; adapt or die...or be lucky enough to be the chosen few who will end up living a better life because of the change.