I think it's only gotten more popular on the international level. It's a matter of national pride. I'm hoping I'm alive for the day the U.S wins the World Cup so I can see the world lose its shit.
I think it's a little more popular as more immigrants in it will grow.
Now me personally I don't follow it.
it's gotten a little more popular, but it won't ever break through and become a top sport in USA.
too slow, kinda the same reason baseball is falling off now.
Here in Utah we have an MLS team (Real Salt Lake) and it definitely has its fans, but on a national scale I haven't perceived any increase in the give-a-shit level for soccer.
I honestly don't think it will ever be a huge sport here, but I guess you never know. I personally have no interest in watching it unless I'm just hanging out with some friends at a game.