Things that don't exist yet aren't a solution for problems we have now.
It's not like we could now just build a thorium reactor that makes economic sense without decades of serious prototyping. And by that time we might have found that there are more pbolems with it than we thought.
Strange source aside I've been hearing were on the edge of a breakthrough for thorium reactors and cold fusion for 40 years now.
If China had it working already then we would have heard it a lot louder from them.