Bottom line: In 1984, DOS PCs outsold the Mac 6-to-1. By 2004, the ratio of Windows PCs to Macs sold peaked at 56-to-1. Today itâ€™s under 20-to-1 and still dropping â€” but if you include iOS devices, itâ€™s down to 2-to-1. Staggering.
And Dediu expects parity in at most two years.