We just returned from a short trip to Cairo. We spoke with a few people about the revolution. There is certainly hope but not really the spirit of change. Egyptians have listened to President Obama's historical speech on June 4, 2009 in Cairo but also have noted that his words on America's support of democracy all over the world were not meant very seriously.
That the revolution in Egypt is now irreversible may be an over-opimistic conclusion by Mohamed ElBaradei who might run for presidency in September but without any real chance. See his interview with Charlie Rose while promoting his new book The Age of Deception: Nuclear Diplomacy in Treacherous Times here.