Amusement parks have always been bursts of feast, followed by extended famine. Do a search for “abandoned amusement parks pictures”. Even parts of Disney World have been closed to the public and abandoned.
Walt Disney was smart to set up Disneyland as part of an entertainment empire, so other parts of the corporation would pick up the slack when tourism was off.
My own experience was with Legend City, between Phoenix and Tempe, which lasted from 1963-1983. It *never* made a lot of money, even when it was sold to Mitsubishi Corporation.
I have been to Walt Disney World more times than I care to remember. Many sections have been closed down for remodeling but the only thing that has been abandoned is Discovery Island. That was closed down because of bacteria in the water.