This paper describes the profound transformation of marketing driven by autonomous AI, which moves beyond simple automation to independent decision-making systems. It details key enabling frameworks like AutoGPT, Baby-AGI, and LangChain, highlighting their unique capabilities for tasks like end-to-end campaign management and hyper-personalization. However, the text also emphasizes the significant challenges of this new era, including data governance, the "black box" problem requiring explainable AI (XAI), and the risks of errors at scale, stressing the need for human ethical oversight and control mechanisms. Ultimately, it argues for a fundamental shift in the marketer's role towards strategic leadership and collaboration with AI, requiring a significant focus on reskilling and fostering an AI-ready organizational culture.