I'm not sure it will be reported as fair and balanced. If he asks hard questions of Hillary, it will be reported as attacking her. If he asks fair questions of Donald it will be reported as going easy on him. Mr. Wallace is in a no win situation as far as the Main Stream Media is concerned.
On the other hand, I've watched Mr. Wallace interviews with Hillary over the last several years and I thought he was always fair but did ask the hard questions when appropriate. I think that the voting public will view the debate as fair. Some will be swayed by the MSM versions of what happens but most respect and trust Congress more than the media. and that is saying a whole lot abut the MAM.