Any shooting will be in the large cities. While not impossible I doubt there will be a mass exodus of the urban centers.
AP,
Remember that truck driver who got caught in the middle of that LA riot? He was at the wrong place at the wrong time.
Given your comment that there only will be shooting in the large cities, how many truck drivers do you think will be willing to deliver food into those free fire zones?
IF any shooting does start, I agree it will begin there. Secondary and tertiary impacts would be people leaving the larger cities and seeking safe harbor with a relative living in the boonies.
My two cents,
MFO