If the mystique for guns goes away, they will turn to something else. Poison, handmade bombs, anything.
Making guns less Mysterious has nothing to do with it to be honest.
Even if 100% of people in a contained area of 100 people were carrying, they are not thinking of defense 100% of the time, are not tactically moving everywhere they go with their pistol in the ready position. That would be ridiculous even in your utopian world of gun protection. Now, only one person is psychopathic. They are dedicated to kill. They are therefore the only 1% dedicated to kill in the entire group, and except for maybe another 1% of that group actively paranoid of gunmen, the rest are sheep. That psycho doesn't want to live. Doesn't want to live is the key. You could kill him with a hundred bullets, but the psycho doesn't care, if they haven't taken their own lives yet. They kill as many as they want. He gets the drop on at LEAST one person, no matter how well armed. Gunshot, boom, one person dead. They with their family? Three to more dead in a few shots. Maybe someone by now has caught on and started running/drawing their weapon.
My point is, these psychos will not be stopped by everyone being strapped. If everyone were carrying, then everyone would get used to seeing guns, and not notice the sick ones. Then the shots. Unless this is the first time ever, people in this 100% carrying world will get used to gun shots, and therefore will react slower. I don't care what super-human speeds and skills you think you have, no one will stop those initial deaths. Still happy now about your CCW carrying world? Those dead people aren't. Those fancy death wands are useless at that point. Ever notice the trend of general lack of care with these psychos? They don't care. They wouldn't care if there was a tank in their way. Even a society of tank wielding citizens wouldn't stop him. The problem of escalation, not to mention the social qualities of that CCW carrying world, are a constant factor.
Hate to bring out my more "anti-gun toting" wild west side to myself, as I generally support the right to bear arms, but this world of everyone carrying is just ludicrous. There are a million more ways to solve violence than just more violence. And even then, not everything is perfect, and some part of society will fail some people, and eventually this will happen. It will happen, and its sad really, but a world of gunslingers won't fix a damn thing.