I doubt Bloomberg uses eight grade chemistry, biology or physics in his day job either. We still teach the sciences -- if nothing else than as a way to entice kids to continue studying it and keeping a steady influx of engineers in to society. There is nothing different about computation, per se. Instead of a teacher droning on to kids about how to surf, let them learn how to do webpages, or robots. Get them excited about CS and try to disspel the notion that the machine they're sitting by is in any way, shape or form magical and archaic.

As for Bloomberg at this phase in his life picking up coding, probably not. On the other hand, he made his fortune in part via hardware and software, so I doubt he's completely clueless about it even now.