This is a terrible idea.
Taking away guns won't do anything to help anyone. Crime won't go down, because the government is ignoring the larger socio-economic problems that cause that crime. Moreover, people will be less afraid to commit violent crimes because they won't have to worry about getting shot.
Gangs and large scale criminal organizations will still have guns. Guns can still be bought illegally, and all the crimes will still occur, especially since knife attacks and car bombings are just as effective.
The only things that would go down will be school shootings, which is great, but the total deaths will be mostly unaffected since school shooting deaths are super small in the grand scheme of things.
All you're doing by taking away guns is limiting the ability for the weak and untrained to defend themselves.