Changing all the team names to sound more like legit football clubs helps with the international audience as well. I mean the Kansas City Wizards was a joke. Sporting KC, while lacking the initial brand recognition when they changed, now is a legit club with a top notch stadium, and the best uniforms in MLS. You still have some of the nicknames like Sounders and Timbers but those fan bases are among the best in the world.
The one thing holding professional soccer back in the US is the lack of pro/rel...which because of the exorbitant expansion fees paid by MLS clubs, is something that won't happen for 10+ years if it ever does. The last week of any Euro league is as compelling for the teams trying to avoid relegation as it is for the teams competing to win the title. The excitement of those fans if their team avoids relegation, the fervor from the fans of the teams in the 2nd division who have that chance at promotion on that last day of play. EVERY GAME IN THE LEAGUE BEING PLAYED AT THE SAME EXACT TIME!!!! Maybe the only thing that comes close in the US is the Thursday/Friday opening the NCAA basketball tournament.
Can you imagine a final week of the USL Championship season and FC Tulsa has a chance at promotion to MLS but has to beat Louisville City to get that spot?