Link to video, article
Watch the Shannon Sharpe interview and then read the Kirwin column.
Personally, I'm not worried about his physical health. Injuries happen in the NFL and he's been here long enough to know he's a tad injury-prone but that he's capable of getting through a whole season.
My concern is the Joe-Biden-like gaffes that pop up at just the wrong moment. It helps that we have a running game that can take pressure off the passing game and we have a defense that can now keep lesser teams from putting up points but I am skittish that if the conference championship game or the Super Bowl came down to converting a 4th-and-4 that Schaub is going to find the right receiver and make the right throw.
Hopefully, we reach a point in the season where we can find out.