Abstract

In 2025, AI’s predictive surge—epitomized by GPT-5, Neuralink trials, and the EU AI Act—threatens to erase uncertainty from human life. This paper projects two futures from this trajectory: a “Certainty Cascade” by 2050, where saturation births “Certains”—efficient, doubt-free, yet stagnant—and an “Uncertainty Refusal,” where “Unknowers” resist, preserving risk and vitality. Extended to 2100 as a thought boundary, these scenarios test uncertainty’s role in essence, not intellect. Sartre’s freedom and Heidegger’s enframing judge the former as a loss of agency and wonder; Kierkegaard’s leap and Camus’ rebellion frame the latter as humanity’s pulse. Grounded in data (e.g., 40% AI diagnostics, 70% trust), this departs from Bostrom’s superintelligence, offering “predictive saturation” as a new lens. It argues uncertainty’s erosion redefines us—philosophy must weigh adaptation’s cost and refusal’s promise.