I'm sure if Tommy Tune brings Doolittle to Broadway this season, it will affect the Best Actor and Director categories at least, possibly it will affect the Best Musical category given we are talking about the director of landmark musicals such as Nine.
Wickedfreak, like other people have been saying, just because Wicked appeals to a broader audience than Avenue Q, I'm sure the Tony committee paid more attention to the way Avenue Q was written, constructed, sounded, and looked on the stage rather than the money the show was getting. Not going to get too much on the Wicked v. Av.Q battle though....and also, what are those themes Mamma Mia has that are so deep? I do believe it deserved a Best Book nod. maybe not over By Jeeves, but I insist that it is hard to take a whole bunch of pre-existing songs and turn them into a coherent show, this has been proved by all the subsequent disastrous jukebox musicals after Mamma Mia.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"