Re: "..for another 300 years or so.."
In reality the risk from the radiation is small, but people are paranoid about it now compared to, say, the very real risks of death or injury from car use, etc.
For comparison, think of how long it has taken for the forests to grow back after we raided them for fuel and building materials. Oh wait, they haven’t...
Or how long the impact of CO2 from coal, oil and gas will impact on the world?