Vivek seemed like a quality guy and I think his decision to enter this race at all was strategic in order to secure some sort of cabinet position or set himself up for a run at some other office in the future. I don't think he really ever thought he had a chance. DeSantis I believe thought he genuinely had a chance since he was thrust into the spotlight over Covid.
I think once Haley loses in her own state that she will drop out as well.