Can anyone really imagine that? If you're a gun owner right now, chances are you definitely can't imagine that. But to tell you the truth, even if you aren't, I have a feeling you've gotten so used to the guns-in-everyones-hands that the possible reality doesn't really seem to believable in your mind either. And the rest of the world? Does anyone at all really imagine the the people of the U.S. with a lot less guns? I doubt that.
The thing is that whatever will be done about the gun control, I personally have serious doubts about its actual effectiveness. It sounds a lot like the talks about prostitution and pot. A lot has been attempted but independent of the actions, in reality there hasn't been any changes in peoples behavior. Am I wrong?
Of course, that doesn't mean people shouldn't try to do what they feel is needed. You could try. Like Obama right now is looking at issuing 19 executive actions on gun control. One of the ones that makes the gun lobby nervous is the idea to allow the Centers for Disease Control and Prevention to research gun violence. You can read a bit more about it
here.