While I agree with you all that TNG didn't do enough in following up The Inner Light, I just want to say that Lessons at least gave it some followup, which I enjoyed. Not at all like the great work Christopher did here, but it wasn't entirely swept under the rug either. The fact that there was any followup at all for TNG is somewhat rare.
I haven't chimed in yet, and just want to say that I loved the book Christopher. I love the TNG characters so much that just having things slow down a bit and have them talk about what is going on with them was great. Again, kudos.