I disagree; politics are a small factor, but up-front capital costs are by far the bigger issue. The most salient example is South Carolina, where it was up-front construction costs that axed the project. They poured billions into the plant multiple times and it never was completed.

I'm all for advanced nuclear but it's never going to happen with such high start-up costs, especially outside of an authoritarian economy like China, which is basically the only country making major expansions to nuclear today. Maybe traveling wave or molten salt or modular reactors could be cheaper and better on fundamentals, but if the cost to start-up is still very high, the LCOE isn't going to beat renewables/storage in the medium/long term.

On top of this, look at energy widely. Demand is flat, old coal is shutting down, new renewables/storage and new-ish gas turbines are going to be online for a couple decades. Where is the payback potential for an expensive nuclear plant in a flat-demand environment? Renewables kill the wholesale cost to boot, so nuclear would be running a deficit in windy or sunny times. It's just hard to make the numbers work.