Agreed on the quote from Michan (can't find it now, but quoted two posts above me). This was not a decision made to keep an image intact or to please other people. Can you honestly say something like that about Ayu, whose motivation for changing this concert was to re-inspire the hope and passion of a nation who's felt rather broken and bewildered in the past couple of months, and has suffered a lot of hurt? Glitz is wonderful and fun, but it doesn't touch your heart.
There was something Ayu wrote in her blog not too long ago, saying that this is something she has to do because of who she is: she is a public figure to whom many people look for an example, encouragement, support, etc. As such, she's trying to fulfill that role by stripping down to what she ultimately is: a musician. It's music that inspires people's hearts.
Anyway, at an Ayu concert, honestly, you're not going to start crying because Shuya and Ayu are lovers that can never - tragically - be (again!). ;P You'll cry because of the lyrics, and the music, and the rawness of Ayu's voice!