Once Mexico gets their feet sorted, they'll easily return to being the kings of Concacaf
lol, oldest team at the World Cup, didn't make it out. USA 2nd youngest team, champions of Nations League, champions of the Gold Cup without the best players beating most of Mexico's best... Mexico has little in the way of reinforcements coming.
Mexico "getting their feet sorted" to "easily return to being the kings" is a ways away, and at this point, nothing but a hypothetical.
USA is a giant nation, very wealthy and hyper-rabid of sports. The only question is whether the passion will be there to stay good at Soccer, for now though, USA has a much brighter future than Mexico.