In the 1980’s Nintendo was on top of the world, with the NES achieving over 90% market share of home video games globally. So how did they fall ALL the way down to ~10% in just a few short console generations? And how did they then build themselves back up (and down and up again) to the top of the world again? Spoiler: it all hinged on one very small, yet very large and durable platform… the…