I was really dissappointed in the first of the "Second Foundation Trilogy". The other two books were better (and I noticed that passage you quoted there), but I feel like "Foundation and Chaos" and "Foundation's Triumph" had to spend a lot of time to try to fix the problems from the first book (wormholes, really???).
But, it was a long time I read these, and I recently begun to go through the Robot/Empire/Foundation-books again (are there a good shorter name for this series), so we have to see if I change my mind.
"Robots in Time" are awful, though. Haven't read the Caliban trilogy yet. The "Robot City"-stuff and the "spinoffs" are okay-ish. Better than "Robots in Time", but that doesn't say much..
Some stories in "Foundation's Friends" are quite good, actually, though.
Still want to see a book that takes place after "Foundation and Earth", though. I would recommend an eventual merging of the first and second foundation.