@lord-of-roses I wouldn't say that. Ten Desires is the 13th game, and I'd say the fandom started losing force after the 15th game, Legacy of Lunatic Kingdom. For reference, the 17th game, Wily Beast and Weakest Creature, just came out like a month ago.
The reason I'd say that is because as you said, the very obvious culprit behind Touhou's waning popularity is Kantai Collection, which came out around the same time as the 14th game, Double Dealing Character, the game this character is from. I'd say it took until the 15th game because LoLK was a huge hit, even by Touhou's standards, and it briefly brought a lot of the fandom back.
last edited at Sep 24, 2019 11:48AM