But that is the entire thing that makes Google's phones fundamentally better than most other phones[1]! They are, by design, entirely hackable. If you wish, you can get root on your phone; they explicitly make them this way. You're "allowed" to. No security exploits needed.
And, if they are true to their word--and there's no reason to think they won't be--the same will go for their computer-glasses.
[1]: EDIT: I mean that they are objectively, indisputably better in this fundamental way (of being expressly hackable by design). I am not saying Google's phones are better in all ways.
Well, when they come out in the end and are easily hackable (they provide stock images, they provide the source code for everything in a way that we can compile, etc.) then that will be great, but as long as I'm having to use exploits to easily get root on the device (which I did) I'm going to say "jailbreak" ;P.
I was mainly replying to the notion that hackable devices are a "dying category". Clearly that is something we are gradually losing, in this age of the DMCA and locked-down app stores. But Google is one of the few major smartphone/table companies bucking that trend.
Hopefully, this will continue to be the case, although they have been slow sometimes in getting it all sorted out when new hardware comes out...