Eventually. Who is to say when though.
Above someone said that war and depression almost brought an end to the amusement park. Acutally, parks survived through out the the Great Depression and WWII. The "decline" of parks began in the 1950's when other forms of entertainment began to compete with the parks. Shifts in population also began to affect parks.
It was also in the 1950's that Walt Disney came up with his idea for a new type of amusement park... the Theme Park. In his book "Hersheypark: The Sweetness of Success", Charles Jaques tells how other park owners all thought Disney would fail. They thought it would be just like a World's Fair and would be popular for a few years but then the novelty would wear off and it would turn into a regular old amusement park or close completely. Well, we all know that did not happen and other park owners realized that they had better improve their parks or else fail, which led directly to the 1970's and the opening of the new modern amusement / Theme parks... or the "rebirth" of older parks.
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"I wasn't always this cynical, but then I started kindergarden..."