[SturgeonsLaw]

According to the World Nuclear Association, there is approximately 5.7M tons of recoverable uranium globally. [0]

The Minerals Council of Australia shows that the current worldwide uranium usage is increasing by about 4.8% p.a., projected to hit 97,900 tons in 2020. [1]

This will give us a little over 60 years until almost all of the economical sources of uranium are consumed, assuming conventional reactors.

Considering that timeframe along with the fact that plants take 7-15 years to bring online if they're started now, and the fact that they have dismal returns on investment, means there's little appetite for nuclear for economic reasons.

[0] http://www.world-nuclear.org/information-library/nuclear-fue... [1] http://www.minerals.org.au/resources/uranium/uranium_nuclear...