Conversation so far:
What team did Joe Namath play for in Super Bowl III?
Joe Namath played for the New York Jets in Super Bowl III.
What team did Joe Namath play against in Super Bowl III?
Joe Namath played for the New York Jets against the Baltimore Colts in Super Bowl III.
Which team won the Super Bowl III?
The high point of Joe Namath's career was his performance in the Jets' 16–7 win over the Baltimore Colts in Super Bowl III in January 1969
What did Joe Namath do after Super Bowl III?
After the Super Bowl victory, Joe Namath opened an Upper East Side nightclub called Bachelors III, which not only drew big names in sports, entertainment, and politics, but organized crime.
Is there anything else interesting about the Super Bowl III besides the Jets winning over the Colts and Namath opening a nightclub called Bachelors III?
The New York Jets' Super Bowl III win gave the AFL instant legitimacy even to skeptics.

Question: Why were people skeptical about the AFL?
Self-contained rewrite: Why were people skeptical about the AFL?