Yes but, and this is the point that people seem to miss, that means you don't have to have them burning the rest of the time. This is still better than the actual situation that "we shouldn't do anything unless its big nuclear" proponents are helping to maintain where you are burning carbon all the time because we aren't building nuclear reactors in the real world for a variety of reasons (mostly political) and aren't likely to do so any time soon. So let's do the thing that makes things better and is politically possible even if its not perfect rather than doing nothing.
