Edit: mainly google needs to create a developer and hacker community, of web developers to show a browser is enough to do everything for personal and business.
But in any case, they all have a developer mode which allows you to install other OSes including Linux. My Samsung ARM Chromebook sort-of "dual boots" (there is no interactive boot manager, so to boot to the other side I need to load up the active side and then run a shell script which switches the boot partition), but the system boots up so fast this isn't much of a problem.
It only has 2 cores, though and I don't expect that to be a spec that gets pushed up much in the near future since there are current practical limits on how much more cores will help a browser.
The Toyota/Lexus metaphor is totally pointless. As a developer and proponent of web based IDEs, I believe that a platform needs its developers on itself in the longterm, not on some other platforms.