Generally; severability where less speech results. If any part, section, subsection, paragraph, subparagraph, sentence, phrase, clause, term or word of this article is declared or held to be invalid or unconstitutional by any court of competent jurisdiction, such declaration or holding shall not affect any other part, section, subsection, paragraph, subparagraph, sentence, phrase, clause, term or word of this article, even if such severability would result in less speech, whether by subjecting previously exempt signs to this article's permitting requirements, or otherwise.