The recent revolutions in Tunisia and Egypt succeeded because (1) public hostility to the regime was nearly unanimous and (2) the military was not willing to defend the regime. Even in the Arab/Muslim world, that is a very unusual combination of circumstances. Protests have been going on across the Arab world and in Iran and Senegal, but I don’t believe there is a single instance where the Egyptian success can be repeated, not this year. In Iran, for instance, the regime can count on popular support – if not a majority, then a very substantial and zealous minority. In Syria, Assad still has the army on his side. So does Gaddafi.
However, the protesters may in some instances succeed in getting the regime to loosen up a little, institute reforms, end States of Emergency, etc.; and in those instances, the reforms might start the ball rolling, so that the state in question can perhaps evolve into a real democracy over the years. Anyone disagree?