And time travel to the future is rarely possible in fiction, for whatever reason (there are usually plenty of justifications, but the main reason is that it's more fun to send characters back into a known past). Anyway, sending them into the future here would be unpredictable, obviously.
Typically those in the USA who are for increased gun control are not those who are for guns in every classroom (something that was extremely ironically suggested by the NRA yesterday). Turning schools into bunkers is a completely retarded idea, and I can only think the NRA introduced it because they knew it would shift the conversation away from gun control.
Anyway, any sane person realizes that a complete eradication of guns is not only unfeasible but undesirable. Most of us only want the eradication of assault weapons and more thorough background checks/screenings on everything else. Along with easier access to mental health care, better gun education, and so on.