I don't think she or any woman will ever coach in the NBA.
That's not a matter of competences or knowledge and we know Becky is filled with them but imagine you're a GM and consider Becky as a coach... Think longer with all the ins and outs and you'll probably conclude that can't do it, which Pop and RC did...
That's one thing to coach for a few games a bunch of obeying, docile rookies and no name wannabees in summer league, that's another to coach day in day out male NBA star or superstar millionaires.
At the end of the day men are men, women women and guys don't react the same way with a woman, either by mysoginy or on the contrary to protect her. There are a lot of things going on in a team's life and players won't act and react as naturally with a woman as head coach, even unconsciously.
I don't see Harden, Westbrook, Lebron, Kawhi, LMA or whoever being really receptive or impressed by a Becky's rant or yelling at them at half time, on the bench or in practice as I don't see them follow her lead... Players and coaches may clash too sometimes, which can be sane but players wouldn't as naturally air it out with a female coach. How would she deal with players clashing or fighting too?
There's a lot of testosterone and psycholgy going on between a coach and players, a mix of "bro" codes or father figure depending, that need to be there for players to accept the coach leadership then form a "team" they all belong to. That won't exist with a woman that will never really belong to the group no matter what and will stay external. You can't fight nature.
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That exclusion would physically manifest by her absence from the locker room where a lot of things are playing, for the most part... "Beware guys, towels on... Coach Becky wants to get in... I don't see her knocking at a player's hotel room on the road to talk either...
imagine you're an NBA GM and you have to pick a coach... All things considered, do you really give your team filled with 7 foot, male, 20-30 millionaire, egotic athlet stars to Becky?
I don't think a GM will.