Well, you just store all your data on the NSA cloud from your NSA terminal.
To your point about he MacBook one port. They do offer a rather smart "splitter" dongle at $60-$90 that allows you to charge while I/Oing other data when that uncommon scenario uncommonly arises.
I just don't get the whole Google approach. They think far higher of their "OS" than is warranted. They should have been selling this thing as a loss leader at around =<$800. I don't know too many people ... as in none ... who want to spend $1k on a Google "OS" machine.
If it had 256GB and Ubunutu it would be the Linux Macbook we need. A large portion of buyers will almost certainly be trying to run GNU/Linux on it anyway.
"How hard would it be to install Ubuntu" is the first thing I think whenever I see a Chromebook.
I never look into it further because I assume they've made it difficult.
If you'd rather blow away ChromeOS and install Ubuntu, it's just a few commands on the command line to boot from USB and install Ubuntu.