As the science of robotics advances, we're going to be seeing more and more of this in all fields of work. It may not happen in our lifetimes, but eventually we as a society are going to have to deal with greater and greater masses of people being made permanently redundant.
According to current theories, our sun will never go supernova. It doesn't have enough mass. It will eventually swell up to red giant size and then collapse into a white dwarf.
Cute and all, but there's going to be more and more of this sort of thing, and as you say in a couple of articles down, that's more and more human jobs going away.
Max Brookks' definitive Zombie Survival Guide also discusses the advantages of bikes- along with what's already noted, they are easier to repair than a car, and if you have to, you can carry them over/around obstacles. I suspect they don't get used much in zombie movies because it IS hard to look cool riding one.
Andy Griffith's first starring acting role was playing "Lonesome" Rhodes in the film A Face In The Crowd. It's generally considered his finest performance, but it messed him up so much mentally it was decades before he agreed to again play any sort of villainous character.