[The Centers for Disease Control and Prevention] estimates that from the 1976-1977 season to the 2006-2007 flu season, flu-associated deaths ranged from a low of about 3,000 to a high of about 49,000 people.So if we go with that low number, it's likely that this flu season will kill about 3,000 people in the United States.
Estimating Seasonal Influenza-Associated Deaths in the United States: CDC Study Confirms Variability of Flu
also from the CDC, it seems that most of us aren't vaccinated every year.
Which leads me to wonder: If we presume that some of the reasons people aren't vaccinated against influenza are roughly the same as the reasons why people don't partake of any other vaccine - too young, compromised immune system, allergies, et cetera, why don't we see the same level of interest in making sure that every has a flu shot as we are in making sure that all children receive measles shots?
My guess, this time a simple one, is that people simply aren't as afraid of the flu as they are of measles. Which makes sense. The flu, while a threat, is more or less a mundane and everyday sort of issue, seen by most people as a given. Which is a recognized confounding factor in most people's ability to accurately gauge the level of a threat.