At last I finally started remembering some of these old novels. The Foundation series was feeling pretty new, but once I got to these, things started coming back. Of course it's almost a month later, and I'm just now getting around to writing this...so I can't quite remember anything that particularly stood out from this book.
It definitely was a little strange how the ending insinuated that there was another human species on the verge of taking over... maybe that's a reference to the other species that took over the galaxy in the altered future set up by Eternity in End of Eternity...which was eventually reset and, through the actions in this book, prevented, as humanity took to the stars and grew enough to become the dominant power in the galaxy. Or maybe I'm stretching just a little bit!