During the summers of 1964 and 1965, there was a large decrease in the number of visitors to Coney Island because of the 1964/1965 World's Fair at Flushing Meadows–Corona Park in Queens. Crime increases, insufficient parking facilities, bad weather, and the post-World War II automotive boom were also cited as contributing factors in the visitor decrease. During the summer of 1964, concessionaires saw their lowest profits in a quarter-century. Ride operators reported that they had 30% to 90% fewer visitors in 1964 compared to the previous year.
In 1964, Coney Island's last remaining large theme park, Steeplechase Park, was closed and subsequently demolished.
You can understand why. Nostalgia aside, it must have felt old and hopelessly bygone.