It could hurt, actually. There was a peer reviewed Canadian study that found that in the event of a novel flu virus (like the "swine" flu epidemic), those that routinely got flu shots were worse off then those that didn't. 

The effectiveness of the flu shot is highly suspect. It does carry "some" modest risks. 

There are studies that support the WHO recommendation that at risk populations get the shot, but there is no conclusive studies that have proven the shot reduces hospitalization or death in populations not at high risk.

And it shows... doctors don't get the shot.