There won't be a debate. Both of them don't want it. They have nothing to gain if they debate. Now if Haley got the nomination instead, that's a different story.
As for the rest of what you are saying, there seems to be a lot of movement behind Haley right now. The billionaires seemed be lining up behind her. I think the Supreme Court is going to shut down Trump as much as they can. Trump could wreak havoc for the court if he is re-elected. I wouldn't bet that the court shoots him down every chance they get going forward and even after the election when they bring cases to them about this or that voting problems. I think most of them (except Alito and Thomas) are done with the chaos he brings.