DENVER, CO - AUGUST 23: Head coach Bill O'Brien of the Houston Texans watches from the sideline during a preseason game between the Denver Broncos and the Houston Texans at Sports Authority Field at Mile High on August 23, 2014 in Denver, Colorado. (Photo by Justin Edmonds/Getty Images)

After dramatic drop off, embattled coach makes firm statement on his NFL future

Could he be done after just four seasons?

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