Sure you'll be able to upgrade this with more efficient turbines or something, but you'll also be able to put those more efficient turbines in a hydro-electric

Sure you'll be able to upgrade this with more efficient turbines or something, but you'll also be able to put those more efficient turbines in a hydro-electric dam or wind turbine, or coal burning plant. I'm not seeing the magical potential for improvements in concentrated solar that you wouldn't get from any other type of generator.