Well, when that dude drove his truck through a Luby's in Killeen, TX and then proceeded to kill 20 something people with his handgun, it pushed the CCW law that was stalled in the state legislature into becoming law. There is no way to tell how the chips will land with this situation, but it could go either way. All I know is, you are not going to convince a bunch of rural virginians to give up their guns, and you're definitely not gonna do that in Arizona either.
The situation is tragic, but there were heroes involved also. Like the engineering professor who barricaded the door with his body and told his students to jump out the windows and run. That man is a hero and I hope his deeds don't get drowned out by the tragedy.