the various anniversaries were hardly pursued with the same amount of ardour.
Huh?
I seem to recall TOS people saying there was way too much emphasis on TNG in their anniversary year and, and vice versa. I recall several years of VOY people saying "Where's my Voyager stuff?", even though that TV series rated tiny numbers compared to TNG. I recall an outcry when Margaret announced that 2009 was essentially "leaving TOS to JJ", but that the balance would even out eventually. People are complaining that Margaret Clark is not pursuing anything with the ardour they seem to expect.
Even if every book series got four titles each for every year of the next decade, it wouldn't be enough TOS for the TOS people, or enough TNG for the TNG people, or enough NF for the NF people.
Maybe it's a mistake to announce the next eighteen months of titles, and unleash months of grumbling over titles we only have blurbs and writers for? In the late 70s and early 80s we lived in blissful ignorance, waiting for the next copy of "Locus" to find out the title of the one next ST title, due in about four months time. Often, the first we saw of cover art was when the book appeared on the bookshelves.