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The 2004 Boston Red Sox, the American League Wild-Card team, celebrate the franchise's first title in 86 years
Take a good look at that list. A staggering thirteen teams have been snubbed from the playoffs just in the last 6 seasons simply because they happen to be geographically located in a stronger division (isn't that discrimination? Slap a lawsuit on the commissioner's office).
We know the MLB isn't going to change the rule granting divisional champions an automatic playoff berth, nor should they (the other major American sports follow the same format because it keeps more teams in contention, which raises attendance and merchandise sales, and therefore, you guessed it, makes the league more money). But what the NFL, NBA, and NHL does do that the MLB currently doesn't is have multiple wild card teams in each league, which not only addresses the issue of underwhelming divisional winners stealing playoff berths from better teams by adding another (in college sports jargon) "at-large" spot, but it also makes the league more money since more teams are in contention (which makes it more surprising that the MLB hasn't jumped on this by now).
The NFL puts 12 out of their 32 teams in the playoffs, and the NBA and NHL puts more than half their league in, at 16 out of 30. The MLB, since 1995, has only 8 playoff teams out of their 30 franchises. Some would argue 8 out of 30 is fairer, keeping the average teams out of it, which plagues the NBA and NHL playoffs.
But when you look at the 13 teams who have been snubbed from the MLB playoffs in the past 6 years in place of weaker teams, while also considering the historical success of the wild card in baseball (four wild-card teams--- the 1997 Florida Marlins, 2002 Anaheim Angels, 2003 Florida Marlins, and 2004 Boston Red Sox--- all won the World Series, and that's just since the wild card's inception in 1995), it's clear that expanding the playoff teams to 10 by adding another wild card in each league is the right move.
Commissioner Selig, the General Managers, and most of Major League Baseball apparently agree, and after the current labor deal expires on December 11th, 2011, I expect the MLB to have two wild card spots allotted in each league going into the 2012 season.