IMHO, I think my fellow Americans tend to ignore "soccer" because they can't imagine a future in it. For instance, when you play baseball, football, basketball or hockey as a youth, you always imagine being good enough to play professionally and make big money like your favorite player. When you play soccer, it is never presented as a future career option because it is well known that you don't make shit in the MLS. As more Americans make it to the EPL, Serie A, La Liga, etc., you may see more interest but, thats the catch. You won't see more interest until you see more American stars and you won't see more American stars because there isn't much interest.
it is what it is