Is it the only real reason of dropping "another game"?
As for me, I don't mind 3 books (21 chapters) instead of 2 (14) ones even if it takes 3 years in total to complete. The main thing is to retain its high quality regarding the story, dialogues, characters development etc. Devs frequently run out of steam when working on a same story for several years and this severely affects a story quality, particularly endings, for worse.
I hope Philly mapped out the CoBD story really well and there will be no questionable twists and tropes like in "another game" that didn't work out as planned by the creator according to the Patreon polls results.