"MLB's enormous attendance drop due to bad weather or something far worse for baseball?"

Yahoo:

Compared to last season at this juncture, the Boston Red Sox are down about 2,500 fans a game. For the Chicago Cubs and St. Louis Cardinals, it’s nearly 5,000. The Cleveland Indians’ average crowd has dropped more than 5,000, the Texas Rangers’ more than 7,000 and the Pittsburgh Pirates more than 7,500. The Toronto Blue Jays, Detroit Tigers and Kansas City Royals each are in the 8,000-fan range, and the Miami Marlins are pushing 10,000. The most severe is the Baltimore Orioles, who have played six games at home and are at almost 16,000 fewer per.