I don't think anyone intends to remove all guns, legal or illegal, that are out there in the States but to at least make it difficult for clearly mentally ill people, criminals, etc.. to obtain them legally as if they were purchasing a cheeseburger.
I realise criminals can still buy guns in the black market but you have to start somewhere to prevent the easy availability of an insane number of guns that fuel unnecessary violence.
which is why proper licencing including adequte age restrictions, gun safety programs and minimum 30 day wait periods for ALL weapons are where it should start.
it wont have a strong impact on general gun crime nor gun ownership from enthusiasts, what it will stop is Samantha buying a shotgun from best buy and shooting up her best friends trailer for hooking up with Jason when she was out of town.
it will also stop angry 16 year old's from shooting up schools.