93% is great! but this would have been ~100% in pre-automobile era. And would keep falling as we become more and more mobile. Humans may be creatures of habit but not humanity.
I'd guess that urbanites are less predictable. But it would be really neat to see to what degree that holds true and how much (or if) it actually diverges from their suburban counterparts.
(Given the increased density of destinations, increased discoverability of destinations, more efficient and numerous methods of transit and lower travel times, I'd expect they would go more different places more often.)
In the study this is "within a square mile" which is a HUGE portion of san francisco, but doesn't even get me to my dry cleaners in the burbs.