From what I've read about Google, they optimized for flexibility in their space. We tried to do the same, although it became difficult when the company grew faster than the office space (at least until we moved again). Not sure this would be any different in a private offices scenario, though. We had a few people who were less than enthusiastic about the open layout, and we tried to give them the space to break out when needed.

We also communicated our preferences directly. If someone was interrupting us, we would let them know that it was better to send an email or grab us before or after a known distraction (arriving at work, lunch, coffee break, end of day). We tried to schedule meetings on Mondays and Fridays to give us largely uninterrupted time during the week. People respected our preferences and tried to accommodate the "Maker's Schedule."

I'm not sure every company could or should work this way, but I worry that backlash around poor implementations of the open layout will cause us to throw the baby out with the bathwater. It's up to each company to evaluate the compromises necessary to create a productive workspace, open or otherwise. I worked with great people and the open office concept worked for us.