Of course, whether that ever translates to regular viewership for a professional league remains to be seen. Major League Soccer (MLS) has had some great years recently, averaging about 18,000 fans in stadiums across the country. And in some places, the local teams are drawing as many as 40,000 fans like the Seattle Sounders, and that's probably sustainable to some degree. Of course, popularity is a complicated thing, and I would have to judge at least part of that by revenue - and TV revenue is king. So, the current average salary for a professional hockey player is $2.4 million while the average pro soccer player makes about $150,000.
So, there is still a lot of growth to come.