Now, it looks as though he will.
In this NFC East offseason look on FoxSports, Adam Caplan writes that the former Patriot will likely be forced to call it a career at just 27 years old:
The veteran cornerback will retire because of his second serious neck injury in the past two seasons. This one, a source said, will end his career because it’s higher up in his neck. He has a pretty good career in broadcasting waiting if he wants to pursue it. He gave excellent analysis during the season on Comcast Sportsnet Philadelphia after he got hurt.
After four seasons with the Pats, who made him a third-round draft pick in 2005, Hobbs was traded to Philadelphia on draft weekend in 2009. Though he missed just one of 64 games during his time with the Patriots, Hobbs played in eight games each last year and this year due to injuries.