Having been involved in the early stages of the new song book, I usually contribute to these threads. I don't want to repeat what I've posted elsewhere except to say that the only positive aspect I see in the new book is that it contains fewer songs.
Another thought occurs to me in connection with the OP and this goes to human nature.
We all naturally associate memories with music. The quality of the music doesn't matter so much. Each generation has "its music." And, probably since the beginning of time, the older generation has berated the music of the younger generation.
The present generation of Witnesses will be connecting their memories to the music of the new songbook and should the organization survive long enough to produce yet another new songbook, the present generation will rail against any changes contained in that new songbook.
And so it goes . . .