Just my opinion: It will be Chromebook+Android or more the mixture of both. Google is playing well by saying: "The time and technology is not yet ready for this to happen." But I'm also convinced it will happen sooner or later. And I'm sure Apple has some experiments in this direction... iOS and macOS are technically more the same than Android vs. ChromeOS.

I just hope I get a good usable *nix terminal with the laptop mode ;)