That seems extremely conservative. Many people are predicting the singularity around the 2040's. Even current AI is starting to revolutionize the world and allow for robotics and automation almost everywhere. Many of the technologies you mention already exist, it's just a matter of how quickly they will be adopted (which is happening faster than ever http://cdn.theatlantic.com/static/mt/assets/business/technol...)
It's smart to be conservative, in my opinion. Although technology is developing at an ever faster pace many people still overestimate what will be done within decades. There are surprisingly few accurate predictions from 30 years ago and most of them then thought we'd be a lot further than we are.
