Biggest new feature they could add would be to not have an additional screen taking up battery life and shining in my face, unable to be dimmed with f.lux. Maybe instead we could have a row of keys that provide some sort of function, and maybe a key that allows the user to escape. That would be a pretty useful feature that I can guarantee I would use dozens or hundreds of times a day. I'm considering replacing my Mac…
My biggest problem with the touchbar is the escape key. I hate not having tactile feeling for a key I use on a regular basis. I'm constantly missing it or hitting something on accident.
Make sure you choose the real keyboard if you also have a Yubikey plugged in :)