Good! Good for the book trade, good for readers, good for authors. Every book that sells is good for all concerned.
I don't think it's good for authors who do not write in this genre, and who will now have a harder time than ever getting their work sold, because publishers will only have that success as guiding light: it's a trend-governed trade, and woe to you if you are not in trend.
There are many, many well-written, beautiful, original stories which will not be heard because of this. And many willing readers of such stories who won't get to read them.
Good for the publishers concerned, though, and for such readers whose needs
are being met. And for authors
in that genre, and ff authors. Their day has certainly arrived.
I am just not not convinced this is good for
all authors. I feel a momentous turning away from my kind of work. My heart sinks in despair...
But no! There is light at the end of the tunnel! I still believe! I will slog on!