It would really surprise me if Apple got there first. Tim lacks vision and will keep on milking iOS even if the iPad Pro is a failure as a laptop replacement.
Windows is still king in the desktop space, at least as far a user base goes, but it's terrible on tablets and phones. MS has all the tech in place with UWP, but it's still pretty far in the race in terms of simplicity and usability.
Chrome OS ticks all the right boxes, and is experiencing a huge growth, but it's not universal. If Andromeda is real, and it's able to become a universal OS that merges Chrome OS and Android it might be the best thing since sliced bread.