My apologies, then, I misinterpreted.
Are you proposing that the solution to mitigate this potential is to prohibit home storage of guns and ammo? I think that would be too extreme a stance to fly in the USA. Home protection and all (not that I think home shootouts are in any way a sane scenario, but many do). Annual licensing, tied into a criminal/mental health database is the most likely mitigating measure, I would think. The occasional crime of passion would remain a very real threat, as it is now.
Re the highlight - the short answer is "Yes", at least in so far as I am definitely saying that as long as you allow millions of ordinary people to keep loaded guns in their homes, then you will inevitably see exactly all of the public shooting cases that we actually have seen in the US news over the past decades. IOW - afaik that is exactly what has actually happened in virtually every US shooting case (and I am thinking here particularly of the spree shootings such as the Florida School, but also most other examples of public shootings too) – in “every” case (with the caution of adding "afaik", and putting "every" in parenthesis in case there are some exceptions), what allowed to shooter to kill any of those people, was the fact that the shooter had the guns and bullets amassed in their home.
So I think we do have to address that fact. IOW, here is a statement, see if you think this is true -
“As long as we continue to allow millions of private citizens in the US to stockpile guns and bullets in their own homes, then it's inevitable that every year some of those people will take their weapons onto the streets and start killing people". And no matter what other measures you introduce, such as banning automatic rifles or limiting the number of bullets, that will never significantly reduce the number of shooting incidents (unless of course you limit the number of bullets and the type of guns so dramatically that you are then very close to that same situation that I just described where loaded guns are effectively almost entirely taken out of home ownership)".
But, having said that, if you ask me "do I think that would be too extreme a stance to fly in the USA?" ... then of course I agree that at present (2018), neither US politicians or a large section of the US public want to make a change like that (i.e. effectively a ban on home ownership of guns). However - that certainly does not mean we should deny or ignore home ownership as the main cause of the problem. And nor should it mean that attempted solutions must always allow the same sort of free home ownership that exists now, because that would always be a deliberate recipe for allowing the killing to continue.
So what could I propose to do about home ownership in the US. Well, if we agree that home ownership is 90 to 99.9% of the problem (or whatever % anyone wants to pluck from the air), then I think the US or any other nation should introduce a program of reforms that are designed to minimise, over a period of time, the availability of any loaded guns in private homes (i.e. something similar to what has actually been done in the UK). Because if you fail to do that, then the killings will certainly continue, and probably with little or no significant reduction in the number of deaths.
Final point – is it inevitably the case that the US could never reduce or make illegal home ownership like that? Answer – no, obviously it's not impossible for the US or any nation to do that. But it looks as if it will take a great many more deaths and many more tragic cases like the Florida School shooting before enough people in the US and enough US politicians start to call for really serious limitations on home ownership of lethal weapons, and that may take many more decades … but if that's the only real way to stop it, then I think that in the end that will have to be done.