Andy, of course, is correct in his post above.
BUT... unlikely this will start happening soon in the blue cities in the blue states.
What I think COULD happen will be a complete "design-paradigm" change in urban and perhaps even suburban retail businesses.
That is to say, if you can't stop the threat that exists outside, you can re-design your retail businesses' architecture in order to prevent such threats from getting INSIDE.
How I believe this will be achieved:
First, no more plate glass storefronts. Storefronts will be "solid" -- brick, concrete, steel, stone. In many cases, all that will be there is a sign with the store's logo.
There -might- be display windows, but they'll be of thick glass that can't readily be broken, with steel shutters that can be closed quickly. And there will be solid walls behind them, with doors sufficiently sold/strong enough to prevent entry in the event the heavy outward glass is breached. You won't be able to get into the business "through the windows".
These businesses will also have "airlock-style" entrances, with TWO doors that shoppers must pass to enter. One person at a time, monitored by a guard at all times. At least one of the doors will be heavy steel with reinforced barriers that will make breaking-and-entry (even using a vehicle to try to smash one's way through) all-but impossible.
The exits will also be "airlocked" and monitored, with one-way doors to prevent reverse entry, with sufficient modifications to allow rapid egress in an emergency situation.
If you can't change the people "outside", you CAN change how they get "inside".
(and all you have to do is look around these days to realize that not much is going to be attempted to "change the people outside" -- probably not even possible)
How's that hit ya...?