If anything, what most likely happens is that someone like Mero goes on her show again to justify her opinions in a one sided 'debate'.
The WWE blacklist said that anyone in the business that goes on her show does so at the risk of not working with the WWE again, so that'll take the usual list of suspects that normally would jump at her offer off the table. Those guys still want a piece of the WWE pie. It'll be guys like Mark Mero, who have no intention of going back to Vince, who look to get their last 15 minutes from Nancy Grace.
WWE should, and probably will just ignore this though, because they have nothing to gain from it. Grace will want to be talking about the past. WWE would rather talk about the present and the future. Grace's whole schtick is ambush journalism coupled with an opinion she feels is correct, instead of a mindset that she wants to learn the truth.
If they actually did take her up on this though, there is only one guy in the company I'd trust to 'win' the debate. Paul Heyman. Well spoken, knowledgeable, passionate, competitive and he likes to debate. Put Pauly across a table from someone like Nancy Grace, and it would be a train wreck for her.
You don't use Otunga because regardless of how educated he is, and how well he can speak... his physique looks like someone who's on steroids. She would zone in on that and put him on the defensive. It wouldn't matter if he shuts her down right away, because Grace's act is like a pit bull in the sense that once she states an opinion as fact, she doesn't let go of it. You wouldn't get anywhere in the end.
I wouldn't use Dutch either because he can have a tendency to go off the rails a bit and she could side track him.
Heyman would hold onto his argument, he'd force her to clarify her position and then he'd interject some real facts into it to show how far off she was. He'd be the guy, if anyone, to beat her at her own game... so much so that I'd expect a lot of sudden commercial breaks if it ever happened.