Exactly. Taking a hint from how Islam takes down a country (financially) and how businesses eliminate competition (financially), this is how you stop other countries from passing the buck or taking advantage. You hit them where it hurts: money. Without money, the country can't exist. The great thing here is that since these people are coming in from Central America and the US is building a wall and moving towards more wall, that would effectively trap them in Mexico and they wouldn't have the money to deal with it or stop them. Mexico knows this.
But nothing has happened?
Yet.
These things take a bit of time. All bluster aside, an international trade and immigration situation is a bit more complicated that deciding which gas station you're going to use today. Do you not understand that?
This is what happens when you have leverage, and use it.