I dont know where you are from, but I am from Northern Ireland, a country that has been plagued with terrorism (from unionist and republican sides) from as many as 90 years (they say the troubles are over, but bomb scares aren't exactly unusual). It has brought about a curious culture.
I was told a story by my history teacher, he said one of his friends was in Scotland, she went to a super market and went to open her handbag to show a person a employee standing beside the entrance. The employee was incredibly confused, she then started to cry, as in Northern Ireland, when you went to the super market, they would check your bags for bombs, she had never in her life went to a supermarket without being searched and it was just so jarring to not be considered a potential terrorist and to be in a public place and feel absolutely safe.
I heard another story about my economics teacher (I am young, so I don't have many exciting stories. I remember the football team I played for had stones thrown at them as it was a catholic team that had played against a protestant one, but i digress), he was to uni in glasgow, and he left his rugby bag on the floor and went off to talk to some people, when he came back it was stolen. It was a culture shock in the sense that no one would ever steal a bag lying on the ground in northern ireland, because that is how people planted bombs in public places, if you saw a unattended bag, you wouldn't steal it, you would report it to the police.
I don't know what point I am making, I guess I am just trying to give some perspective. Tragically I think terrorism isn't actually as unusual as the reaction to this particular case might have you believe (I am absolutely not trying to diminish what happened in paris, which was a tragedy). People seem to have decided to react unanimously against this one attack, for a variety of reasons, but people will move on, and I dare say this will not be in the public consciousness in as little as a few years time.