> It is now economically non-viable.
Nuclear is about the next 50+ years. The economy will explode long before that. Nuclear plants are a way to produce energy in a world without cheap oil. That changes the economical considerations a lot.
Keep in mind similar things have been said about solar and wind previously.
If energy companies won't invest, then either don't invest public funding, or invest but with focus on developing long-term technologies. After all, the primary reason for nuclear being uneconomic today is lack of investment. If solar and wind can be made profitable, I don't see how nuclear is any different.