Well, obviously. Trump could not perform in front of an audience of randomly-selected people, and the commission would not allow him to choose the audience. But why not compromise and simply hold the debates without a live audience?

As for moderators, surely they can find somebody in America who is considered a neutral newsperson, neither pro nor anti Trump. Chris Wallace seems fine to me. This chart seems to indicate that the Wall Street Journal and Christian Science Monitor are either unbiased or only slightly biased, and that AP and Reuters are both dead center and completely reliable.