Many NFL games are not sellouts. The changing demographics of this country will result in soccer (football) becoming more popular. We have 45 million foreign born in this country and the numbers grow every year.
MLS:
19 teams, averaging 19k spectators a game. And per this link, 15 of them are in attendance decline.
http://en.wikipedia.org/wiki/Major_League_Soccer_attendance#Historic_average_attendances
NFL:
32 teams, averaging 68k spectators a game...and contrary to rhetoric in the media, the 2013 numbers were an improvement on the 2012 numbers - its on the upswing.
NCAA Football:
Set an all time record last year with over 50 million people attending college games in 2013.
Now - on to the actual comment that I initially responded to, that predicted Super Bowl like viewership of the World Cup.
In 2010, it was 24.3 million.
The latest Super Bowl - 111 million. Another record, BTW...the NFL is not withering away.
I’m going to stick with my prediction. The US World Cup viewership will come nowhere close to Super Bowl numbers.