I have a ThinkPad but when it's time for a refresh I will probably use the Chromebook. I don't really like maintaining two machines, and the Chromebook works well enough as a work laptop without requiring me to do anything other than sign in with my Google account.
Would be great to see a developer edition of chromebook with a native terminal app.
You can also install your own build on an actual Chromebook, of course, but you lose automatic updates and the secure boot.
You might also consider porting the features you desire to a NaCl app, or contributing to NaCl to add things you need. (Emacs is on my todo list, though not in the near future.)