What's stopping it, though? There are new nuclear plants being constructed in Georgia and there's ~$1 trillion budgeted for renewal of the US nuclear arsenal over the next 30 years (see http://www.nytimes.com/2014/09/22/us/us-ramping-up-major-ren...).

This is about as favorable an environment for Thorium reactors as can be imagined, certainly compared to the last few decades. While I think the technology is promising, if it's such a done deal where's the private capital seeking a building permit?