The entrenched institutional power of Iran's theocratic system, combined with fragmented opposition and limited verifiable domestic momentum for Reza Pahlavi, underpins the 98% implied probability against his leadership in 2026. Recent protests and Pahlavi's October 2026 calls for military defections and a transition roadmap have not produced confirmed regime collapse or broad elite realignment, while reports highlight waning donor support, internal divisions among exiles, and absence of decisive backing from key international actors. Traders price in the structural barriers of the Islamic Republic's security apparatus and electoral mechanics. Realistic shifts remain possible through sudden high-level defections, rapid escalation in protests, or external diplomatic realignments that accelerate a coordinated transition, though these would require developments beyond the current trajectory.