Those in power now could accelerate it(World domination, loss of our sovereignty, etc) by trying to disarm us, or stifle our speech, or tax us into poverty and force dependence upon the government for our every essential need for survival. This would necessitate a purging insurgence and seal their fate in a blood bath. I prefer the election process. But, they've got to know that blood brought freedom to this land, and the Constitution and the rights protected by it are meant to preserve that freedom. We the People retain the arms to draw that blood if necessary. We the People retain the right to those arms, and the power to use them.
If ethics and good moral standards are not present in our elected officials, then they should at least fear for their lives if they design to take our government and freedom out of our hands. One clue they intend harm is the taking or attempted taking of the arms - any arms - that we hold. Another clue they intend harm is the stifling or attempted stifling of our right to speak out against them. Some incursions into our rights have been made by those in government over time. Our RKBA is currently under much infringement. Some of our speech has been hobbled and even prohibited at certain times - the times when it is the most effective, of course, right before an election.
If confiscation should come to pass, it'll most likely be minimized into tiny increments so as not to appear as though those in government wish to totally disarm us. But, that'll be the clue that resistance is in order. It's one of those things that needs to be nipped in the bud.
Have you ever noticed that no machine guns or sawed off shotguns were confiscated by the NFA of '39, or the GCA of '68, or the '86 halt of sales of new machine guns to the public? Why no confiscations? Because those in government know that would incur resistance. Probably organized, armed, and righteous resistance. So, these unconstitutional acts turned the table on everyone.
Rather than those in government taking your arms, if you attempt to obtain one of these arms without jumping through the hoops, paying the "tax", or in defiance of the limitation on the manufacture date of the arm, you are prosecuted according to the unconstitutional law. You are - in the eyes of the law at that point - initiating the "illegal" act. In a confiscation, the government must take the first step. Those in government don't want to appear to be the bad guys, they want you to look bad instead. What we end up with is confiscation by the proxy of prohibition of purchase. Instead of taking your arms away, they make it impossible or "illegal" for you to get them in the first place. By either process, you - or your progeny - eventually end up disarmed and at the mercy of those in government.
Carrying the foregoing to its logical conclusion, We the People will no longer be in charge of our governance. By the time the sheeple figure out something is wrong, they are hobbled, surrounded by barbed wire - to keep them in - and sheared of all the wool they need to keep themselves warm. Now the wolf is well fed, warmly clothed, and all he need do is keep the barbed wire well maintained. At that point, there isn't a whole lot you can bleat about your situation, either... Without becoming the wolf's next meal.
All I can tell you is to be damn careful how you vote. But in the mean time, be aware that confiscation is not unforeseeable, be it indirect, by proxy, or direct.