The only problem with suggestions such as Laura Benanti or Audra McDonald is that they are going to want a big name that will attract the average viewer. Unfortunately, as talented and popular as those ladies might be in the Broadway community, having them host will not tempt more viewers to tune in that night. If we're going for a woman, Idina Menzel could work, given her recent rise to higher stardom, but I'm not sure if she would be up for it. Maybe she could co-host with someone.
I don't know, though, how about Julie Andrews?
"Was uns befreit, das muss stärker sein als wir es sind." -Tanz der Vampire