I believe that the fall of the Morsi government should be seen more as a result of a political party which was to say the least wanting in terms of balance and genuine understanding of those who had made their ascent to power a possibility. With the downfall of Hosni Mubarak during the Arab Spring, people looked for a leader who would fulfill the demands of the protestors. It can be considered that the most important identity of a Government ought to be as the delegates of public opinion. This is the underpinning concept of indirect democracy and those who chose not to abide by it have to be willing to set up a dictatorship fast or face the metaphorical boot. Considering lives had been lost in the overthrow of Hosni Mubarak, the first option was never going to happen. And so the failure of Mohammed Morsi lies in his failure to implement popular policy. My source for this is The Atlantic (http://www.theatlantic.com...). The graph on the page shows how little he managed to achieve in his first 100 days in power.
There are a number of reasons why it is somewhat far-fetched to believe that it is the fault of the rise of political Islam. To begin with, we have to remember that Islamic Fundamentalism has been prominent within the region for a number of years, with sheikdoms and despots alike all looking towards the use of Islam as a pretext and as a basis which the regimes can be built upon. Iraq and Syria are examples of despotic regimes based on political Islam. We also have to consider the fact that political Islam is often used as a form of realpolitik. Political Islam is often not the basis of regimes but can be reverted to in order to appease citizens. Islam being the religion of the region is going to mean that political Islam is very compatiple with the culture and the ideology of the region.