A tipping point is being reached at WDW, with the theme parks running at near-capacity year-round. The following puts this in historical perspective, showing annual attendance divided by the number of theme parks:
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The problem is not merely at the attractions. The buses, walkways, dining areas, bathrooms, etc. are more crowded than ever. The theme parks were not designed to handle these loads for this extended period of time.
A fifth theme park is needed by 2025 in order to avoid a significant reduction in services.