AI is shifting the power dynamics in product design by reducing designers' dependency on engineering and product approval. The bull case: designers gain more autonomy, can prototype and ship faster, and evolve into hybrid product leaders. The bear case: autonomy exposes weaker designers who relied on organizational constraints as cover, while product managers and engineers armed with AI tools may bypass design altogether. 'Plausible design' — coherent-looking but shallow — becomes easier to produce and harder to distinguish from thoughtful design. The likely outcome is a bifurcation: top designers gain more agency and influence, while many mid-tier roles shrink or shift to governance and maintenance work. Designers who survive will need product judgment, technical curiosity, and commercial awareness beyond taste alone.