Would the show been successful without Ari and Liz?

Honestly, casting directors got three Broadway performers to be on the show. One would think they would hire people talented enough to be on the show but not talented to outperform Victoria like say Halston Sage playing Cat (she played a similar character on How to Rock). Then again, would it be the same problems arise even if different actress playing Jade and Cat like Dirty Dan cutting down on Tori's scenes. Then again, Tori would still be bland because Dirty Dan didn't know how to write a female lead worth a damn.