Fusion, if it gets going, will be better. And that is why it stands an actual chance of replacing fossil fuels.
By the time fusion is ready to replace other energy sources, fossil fuel will no longer be in use. Fusion might be able to replace solar, wind and hydro-electric.
But isn't there right now already a lot of dirty waste that cannot be reprocessed? That's where the subduction zones come in as a solution. I may be wrong about this....
The existing nuclear plants should all be upgraded to Thorium or at least modern technology.