One underperforming song and Oh My Girl are supposedly done. (G)-idle were supposedly done too after the scandal last year or even after Senorita. Kpop fans are funny.
Oh My Girl gained a loyal fanbase after their breakthrough and their physical sales rose. (G)-idle will be fine too and they haven't hit their peak yet.
Kpop moves very fast and a group needs to get a hit every year or it's bad news and brands will go for them less.