Well, there's no harm in replacing the glass since it's been replaced several times over since it was built. If they changed the mullions, then you'd be going into world war 3 with adma... Although I too would like to see an invisible mullion design like Yorkdale's. It's gorgeous. If applied to the Eaton Centre, such a large expanse of this ultra clear glazing would be quite stunning.
At the very least, I'd like to see the glass replaced by either a clear variety or a tinted but glossy kind. The current matte glass just looks dirty. Repaint the mullions and add new glass and I'm happy.