Just read all the pages of the thread., and a couple things came to mind.
One, Obama lost the first debate against Romney. Like, he did. And that's okay. Obama is an eh debater. He always has been. Like he himself said, the best he could do over their thirty million debates in 2008 was draw with Hillary. Hillary is goooood at debating because she's a policy wonk. The minutia of policy is her jam.
Two: Trump is not a good debater, even if I want to pretend that a primary debate is somehow equal to a GE debate. Trump's method was to throw out something insane/insulting, and then retreat back and let the other candidates out cray-cray themselves in an attempt to stop what he had done. That's not something Hillary will do.
Three: Hillary is the perfect person to debate Trump. She's dealt with idiots like this her entire life. She's not going to have a meltdown if he calls (or insinuates) that she's a bitch. She will not get into the gutter with him. It's not her style, nor is it what she does. Like, Hillary wants this bad. She's wanted this bad for a while. This is all some ego exercise for Trump.
Finally, the structure of the debates do not work for Trump. He'll be given 60 or 90 seconds to answer a question. Now, you can fill that with policy...but that requires you to have policy. Trump does not. He's not interested in learning it. Because he uses the same phrases over and over again, it's easy to get a good barb in. The first time he uses the phrase "believe me" you hit him back with "But we don't believe you, Donald." Because, at that point, one of two things happens: he uses it again (and you hit him with it again) or he becomes paranoid about his word choices and just goes off on a tangent. Hell, just watch his interview with Anderson Cooper the other day. It made no sense. This is going to have millions of eyes on it at once.