People seem to be missing the crucial point that our system of checks and balances only works if it intends to. If it possesses both lawlessness on one side and spineless lawlessness on the other, combined with a citizenry devoid of constitutional knowledge, boosted by a heavy dose of apathy, it appears to be a perfect storm in which the constitutional checks and balances are essentially irrelevant.
Evidence of all this is seen in the continued ~46% approval rating of our dear leader despite Fast and Furious, Benghazi, ISIS, etc, etc, etc. It is seen in the popularity of an actual socialist running for president. It is seen in the very fact that someone 77% of Americans describe as a liar, destroyed the Middle East, destroyed rape victims, allowed Americans to die in Benghazi and then lied to the families and the nation and is buried deep in criminal investigations is the far and away front runner for one of the two parties.
Not to be left out is the massive popularity on the other side of a guy that makes bold statements about exactly what HE WILL do when he becomes president, statements that his followers eat up like honey covered salted chocolate caramel, yet it never crosses anyone's mind that most of what he says is subject to constitutional restraints and cannot be done, let alone be done by decree, legally.
In this day and age, the Constitution is no longer relevant and is considered archaic by the youth of today, because essentially none of them were educated to the importance of the Constitution in regards to the survival of this nation. A constitution is only relevant when the elected officials fear a citizenry that knows, understands respects and regards the constitution and will hold them accountable.
When the Presidency is operated without regard to constitutional constraint, when the so called opposition party will not stand up and actually oppose, when the people have little to no understanding or caring about our Constitution and you have a President that says we should look to the confiscations of Australia and elsewhere as the model for what we should do, we have every reason to worry that they are indeed coming for our guns.