Before almost every startup dev in the world was on Macs, only a handful of people were using anything but Windows on the pro desktop... Macs were widely derided for well over a decade, even after OS X and the eventual Intel switch. And then suddenly there was critical mass and they kinda weren't anymore. Nobody in 1997 would've seen that coming, but mistakes that push a handful of people there and a handful of people there to new things have a way of compounding over time.
(Look at how people talk about Google today vs 10 years ago, too, for instance.)