You don't think the cartels have money in reserve for things like this? You don't think there's extremely poor and desperate people who either are already involved or who want to be for the promise of later financial gain? Look at how many people protected Pablo Escobar. I'm sure the US military would make immediate gains and disrupt things, but the cartels would adapt and given their decentralized nature, you aren't going to stop them with brute force. It's a fairy tale spun by Trump. All it would do is drive up the price of drugs, and make addicts stateside more desperate.