While I get the point you are making - you miss the key issue which is the bias people have against the MLS. Nobody in English football circle rates the MLS anywhere near the EPL.
Also - FIFA rankings are notoriously poor at comparing teams since they are weighted rankings and not a straight comparison. The fact that England and USA are next to each other means very little.
Switzerland are currently ranked higher than Brazil for example - but Brazil are a vastly superior team.