Now why hasn’t anyone thought of something like this before? Practically everyone uses earphones these days, and I for one always have to look at the blasted things to figure out which one is supposed to go in which ear. Maybe most people just don’t bother?
Of course, from the consumer’s end this will probably be a very pricey convenience for a long time, once it’s available at all. But from a business perspective, it just goes to prove that there are still little things right under your nose that you could improve, and likely make a bundle doing so.