They'll be fine. Sakura's fans alone won't let them flop. And by the same token she's only out of there if Sakura wants her gone.
Next to an idol literally being a victim, fans love a good bullying narrative that they can flex their lateral thinking skills on. Aside from Soojin who handled everything badly and didn't wait for her stans to save her most other idols with bullying scandals pre/post debut have got past it with their fans more passionate about them than ever. They'll make Garam into the Mother Teresa of rookie idols before the end of the year.