Placing some bets on nuclear make sense (France gets 80% of electric generation from nuclear) but counting on nuclear is risky because nobody can make nuclear plants cost efficiently anymore. America should probably keep trying on a small scale and if they can figure it, then ramp up. The big problem is that nuclear is essentially a big government project, and America is very bad at those.
Russia and China disagree with you. The French and American troubles with building new nuclear plants is more linked to the demise of the state-driven industry in those countries than to some inherent difficulties with nuclear itself.