The driver was, in fact, fired. Pizza Hut is apparently concerned about litigational exposure if they allow their employees to go armed while on company time. Sadly that's not an unreasonable fear in our litigious society. That being said, however, it is at best unfortunate that they have taken that stance.
As for me and mine, we are now exclusively customers of Pizza Ranch!!! (although they probably have the same assinine policy)
I feel SO blessed to have an employer who not only is aware that I carry during working hours, but actually ENCOURAGES me to do so!!