It's a dilemma for Riku for sure. With the negative reception NijiEN has gotten lately and the possibility of it leaking to JP, Riku has a tough decision to make.
EN suffered big especially in 2023 but it still commands extra money for Riku.
Just look at how close the subs and superchat numbers Vox and Kuzuha have.
The Manjisanji mafia still brings in the money for Anycolor. As long as its not bleeding money, I don't see Riku folding the branch unless Vox graduates.