Sounds like the foundation for some legislative changes here in Nebraska.
It may be, but the real problem was probably the fact that they also prohibited guns in the parking lots of those establishments. So, even if you removed your gun and stored it in your vehicle prior to entering the store, you would still have been in violation of the ordinance.
I'm not saying making hay from this isn't worth a shot; I just wouldn't put all of my eggs in that basket. The ordinance was overly broad, and if the parking lots weren't included in the ban, there may have been a different outcome.