Custom minifigure designer Shmails has created a minifigure retrospective of Baseball Hall of Famer Reggie Jackson. The amount of detail that Shmails has put into these custom figs is a great indication of their devotion to the legend and is a fitting tribute.
Although LEGO has had sports themes in the past, seeing these figures makes me believe there's life in the old dog yet.
High interest in The Cheerleader collectible minifigure coming out this June seems to be further evidence that future themes in sports have potential. You wouldn't even need to dedicate an entire play theme to it, just have a collectible minifigure series dedicated to all-time sports legends.
(Picture from Shmails Flickr stream)