Yes, I'm well aware of that, but the article talks about some hypothetical future. It may be that the limits get increased. It may be that they won't care if yo

Yes, I'm well aware of that, but the article talks about some hypothetical future. It may be that the limits get increased. It may be that they won't care if you bring in cash far in excess of those limits as long as you declare it. Et cetera, et cetera, et cetera. The point is that there is no reason to believe Canada or Mexico will necessarily stop you from moving the cash even if the US doesn't want you to.