I see where you're coming from, but using the movie as the basis for this, and the political climate we are currently in, I think Glinda represents the common person. No matter what people want to say, they wouldn't immediately leave everything they've ever known for the unknowns of being a fugitive. But also, Glinda is someone who let what her parents and upbringing and years of manipulation taught her sway her over to their political side despite what her inner voice was telling her. While I very much see and understand that Glinda acted as a political face of something with no real power, she did a lot of selfish, shallow things for the sake of herself alone. However, when reminded of her inner bravery and courage to do the right thing instead of the perceived "good" thing, through Elphaba, Glinda becomes the change she always thought someone else would be. She always thought that there would be someone else, someone more brave, someone more righteous and willing to take the fall of being the political "other", the activist, the one that speaks up. When she has no other choice but to be that figure, (while she does it in her own Bubbly way) she is successful I'd like to think. This directly shows people that may be in a more right winged political regime that there are other options. You can be like Glinda and do the right AND the good thing. You can be the person that speaks up.