I don't think very highly of Throroughly Modern Millie. I would hope someone as talented as Laura Osnes would have to mention dozens of dream roles before mentioning Millie.
At the risk of agreeing with Seth Rudetsky, he often laments current Broadway stars' lack of appreciation for theater history. I think someone like Osnes saying that she loves the show and that Millia is a dream role would reinforce that opinion.
"It does me no injury for my neighbour to say there are 20 gods or no god. It neither picks my pocket, nor breaks my leg."
-- Thomas Jefferson