By Dan Lyons San Francisco nearly made a blockbuster deal more than a decade ago. View the original article to see embedded media. Bears legend and former 49ers coach Mike Singletary is looking to get back into the NFL coaching ranks. In a new profile from The Athletic, Singletary revealed he shot down what would have been a blockbuster trade for Steelers quarterback Ben Roethlisberger in 2009. According to Singletary, San Francisco owner John York, CEO Jed York and director of player personnel Trent Baalke had a deal with Pittsburgh in place. The franchise was willing to trade the future Hall…