I'd bring my own keyboard and mouse. I'd probably also spend the first few minutes of my day cleaning the screen and the desk. The last thing I want to do is use somebody else's nasty keyboard and stare at fingerprints on the screen.

The office I work in, everybody gets a door. With all the arguments about economics, I think some people don't experience the same value to closing the door and working uninterrupted for three or four hours every day. I'm certain whatever the walls cost here, it's small compared to the productivity gains.

Some offices do exactly that. Thinkpad docks everywhere.

This will get even better with USB-C and/or Thunderbolt. Just sit down and with a single cable, get monitor, power, network and peripherals. (Almost) regardless of laptop make & model.

No it won't get better. On a dock, you have to connect exactly zero cables. Just place the laptop on the dock. That's it. No cables. No connectors. The bottom of the laptop has a connection which touches the pins on the top of the dock surface.

Yup, same at my office.