Sure, but the need to transition away from non-renewable energy is not the goal that Bret is working on (limiting anthropogenic CO2 and therefore its atmospheric concentration). I think everyone agrees there is a much longer "grace period" before those resources would be depleted than there is for even the slowest of hypothesized AGW scenarios. So if accelerating the depletion of uranium (ha) would solve the more pressing issue then it makes sense.
Perhaps your concern is that people would get complacent with what can only be a temporary solution (even if temporary means thousands of years), but if AGW is regarded as an urgent and critical problem to solve, I don't think you can afford to ignore the opportunity.
> Currently we have about 200 years of uranium available for economical extraction.
In that 200 years a whole lot more uranium will become available for economical extraction, exactly the same as what happened with oil and natural gas.