Farther than stars said:
There's only one thing that will significantly save lives and that is a full ban on guns, all guns, even and especially handguns. That is the only way to get those stats down. But considering that a majority of Congress is Republican and another majority is in good standing with the NRA, a ban on the second amendment isn't going to happen any time soon.
It doesn't hurt that nobody's actually going to proclaim the desire to ban all guns.
I disagree with your premise, however. Banning guns is unnecessary. Well, let me rephrase. "Banning guns is not necessary to significantly save lives. Common sense gun control is sufficient to do that."
It's a shame the NRA opposes even the softest gun control, especially since their own membership supports most/all of the tenets of say, Obama's gun control policy. Whether you think Obama's gun control goes far enough, the fact is that if you propose it without Obama's name, it gets majority support in this country. Even among NRA members.