The adversaries of our way of life, system of government and liberty have always known they would have to weaken us morally and ultimately take the guns.
Our founders understood this too.
"A general dissolution of the principles and manners will more surely overthrow the liberties of America than the whole force of the common enemy.... While the people are virtuous they cannot be subdued; but once they lose their virtue, they will be ready to surrender their liberties to the first external or internal invader.... If virtue and knowledge are diffused among the people, they will never be enslaved. This will be their great security." - Samuel Adams
But what may stop the multi-nationalists eventually is if a candidate emerges who means what he says and commits himself to reversing, or at least modifying current policies. I doubt it will be a democrat, but a Republican who will prefer to take the party back to its roots.