While he might come up with various factors that one would use, I think he'd likely say that there isn't any formula that you can just plug a case into and give the answer.
Again, from his comments this morning it seems as though he has set forth specific factors to consider, if not in priority form then at least in a list.
Since this may be one of the most significant components of his role on the court (he will run through this list every time there is the possibility that his opinion would require him to overrule precedent) I think that this issue is very important, and could be very enlightening to all of us.