in time it will be Conor. Ronda's downfall was more of an internal struggle, being unable to handle the highs and lows of competition. She lost fans and relevancy by being a sore loser and staying away too long, but she wasn't hurting anyone but herself, and now she has a new gig with WWE so at least she translated her success to something else.
Conor's downfall is more overtly malicious, he is acting out in increasingly extreme ways (first the Bellator incident, then the nightclub drama, now this) and hurting people around him, keeps believing his own hype and thinking he can get away with anything. There's also the cocaine rumors and that he might be cheating on Dee, the mother of his kid, which is a bad look. Like Ronda he's losing fans with his behavior too but in a more objective way, as in you can't be sane and defend his actions today, I feel a lot of Conor fanboys are going to have some buyers remorse now.