Despite Dylan's explanation, the phrase "blowin' in the window" appears to mean more than just change may come eventually. Dylan's phrasing implies a teleological view of history; that is, civilization is moving purposefully towards a particular goal. However, unlike the theoretical inevitability of a Marxist-styled revolution with rules that one could articulate.
上の引用文に出てきた "teleological" を辞書で調べます。下記は原形の "teleology" に対する辞書の説明です。
・Oxford English Dictionary: The explanation of phenomena by the purpose they serve rather than by postulated causes.: Pragmatism in ethics is often regarded as a form of teleology or consequentialism.
・Cambridge English Dictionary:(in philosophy) the belief that everything has a special purpose or use