While it is the intent of this Ordinance to provide stability and regularity in zoning and land use in Kenosha County, it is recognized that zoning is by no means static. It is the intent of this section to recognize that changed or changing conditions call for changed plans, and persons who own property in a particular zone or use district cannot enjoy an eternally vested right to that classification if the public interest demands otherwise. [Code § 12.38-1.]