The Wiki article you link lists a variety of predictions on global peak uranium. The pessimistic ones, which are a minority, mostly predict that it has already happened (1980, or so). There appear to be 3 predictions that average around 80 years, and one predicts with a 6-fold increase in consumption it would last 12 years.

Meanwhile there are just as many optimistic predictions that it will last for thousands of years, if not longer. What makes you so sure it's only 80/6?