I don't know where exactly you got your "facts" from, but they are way off. The Super Bowl doesn't get anywhere near the 1 Billion mark, it barely reaches the 100 Million mark. Where did you get those numbers from? I don't get what entertainment has to do with anything, when we are talking about a SPORTING Event. "Two of televisions top 5 highest ever rated Programs in history have been Super-bowls", you're only speaking of United States, you're not speaking World Wide. There's no sense in saying the Super Bowl is bigger than the World Cup Final. Here are some links that I post, they are not just opinions by me, they are based on facts.
This article is based from 2006, when the last World Cup took place, in comparison to the rest of the sporting events of that year:
http://www.sportsbusinessdaily.com/article/108500
(As you can see on the Graph, the Super Bowl can be compared world-wide to a UEFA Champions League Final, but cannot be compared to the FIFA World Cup Final, let alone the whole World Cup. Or in other words, the Super Bowl can be compared to any game of the World Cup, considering the average audience of any game, besides the later rounds and Final, were estimated at 93-98 Million average per game in '06.)
The 2009 Super Bowl (most watched Super Bowl of all time) only had 98 Million viewers, compare that to the 260-some Million that watched the World Cup Final (which is not the most watched Final in history.)
Football links:
http://www.tvsquad.com/2006/07/25/world-cup-ratings-are-astounding/
http://www.sportsbusinessdaily.com/article/108500
NFL Links:
http://tvbythenumbers.com/2009/02/02/awaiting-super-bowl-ratings/11948
http://www.broadcastingcable.com/article/173576-Super_Bowl_Ratings_Most_Watched_In_History.php