Those categories are orthogonal, they are not mutually exclusive.
The question (as well as the existing answers) is based on a confusion of categories: wrong is a normative (prescriptive) category, while evolving is an empiric (descriptive) category. Those categories are orthogonal, they are not mutually exclusive. Whether some utterance is considered wrong or an evolution of the language, is not an attribute of the utterance, but is determined by the way one chooses to look at it.