I'd like to rip the person who started this thread, but I'm the person who has started the NFL Draft Sucks thread.
My thing is this ... American soccer fans have won. There really is no need to proselytize the goodness of soccer anymore, it has arrived. I can recall having to explain to my dad what the Cup was all about and how big it was as late as 1994. No more.
Look at the World Cup and its coverage.
I watched my first in 1982 off a fuzzy feed from a Spanish language station in Chicago. Only the final was on over-the-air TV. Other than agate in the newspaper, mass coverage didn't exist.
In 1986, NBC showed weekend games (with a big Budweiser banner around the screen). That TV deal might have only been a result of the brief notion that the U.S.A. would get the Cup after it had been awarded to Columbia originally. Mexico got it instead.
In 1990, it got a little better as many (not all) matches were shown on TNT, then a brand new network that wasn't nearly as ubiquitous as it is now.
Of course World Cup '94 changed things drastically. All matches broadcast along with the fact that Americans as a whole embraced the big event nature of the World Cup.
Riding on that, all matches have been broadcast since. But the ancillary coverage -- previews, coverage of the national team -- has progressed and become much, much better and more sophisticated. So have the fans themselves.
As a result, I think it's fair to say that for most of those under 40 the World Cup is an event that ranks along with the Olympics.
Yeah there's soccer haters in that demographic too, but not nearly as many as there were 20 years ago. As the Baby Boomers, the last generation that didn't grow up with soccer in any meaningful way, get older, the World Cup and soccer will only grow stronger in the national consciousness. An increasingly viable and less regional MLS won't hurt either.
Soccer fans won. There's no need to preach to anyone anymore. The hate doesn't bother me as it would have in the 80s and 90s.