The positives are enough of an incentive to have people change their behaviours in order to compensate for the 'negatives' of using such technology. If you know you'll have 30 minutes minimum to kill then you'll plan for it. Lunch time, work time, walk around a park time, meetup and chat with other people who are waiting time, walk your dog time, mini-yoga class time, etc.. Throw in self-driving cars into the mix and the break activities will likely be more social and physical things, and less high mental activity time - unless you're a workaholic.