buck shot: problem solved
Ultimately, the way it will be solved will be the ghetto way. Stores will become armored dispensaries. People will only be let in in small numbers, while the staff will be protected with bullet-proof glass. The doors will lock in the few customers allowed in at any one time. Cameras will be everywhere.
Costs will go up; shopping will be slow and involve long lines for access.
At that point, it will be easier to rob the customers who have gone into the stores than to rob the stores themselves. Other measures will be taken.
Everything will become more expensive.
Cashier pushes a button. An electric screen drops down in front of all exits; a cage of sorts. No one leaves, at least confortably, until authorities arrive.