The Brotherhood is in the process of achieving totalitarian control of Egypt.
Keep in mind that the Muslim Brotherhood has been guided from its very beginning -- SINCE 1928 -- by the goal of a Caliphate that seeks unity in obedience to its Supreme Guide.
The Muslim Brothers will do in Egypt exactly what the "Muslim Devotees" did in Iran: establish an islamic Republic.
That goal of totalitarian control by way of the Caliphate was expressed by the Brotherhood's founder, Hassan al Banna, in a famous formula:
The genius of al-Banna has been his method, how carefully he organized the secret Society of the Muslim Brothers into various sub-groups, and the discipline exercised by the Supreme Guide and its Bureau of Guidance.
Gamal al-Banna, the younger brother of the Muslim Brotherhood's founder
Its disciplined, hierarchical organization enabled the Brotherhood to pursue the Caliphate productively through many years, including extended periods when it was subject to oppression.
Now the Brotherhood has infiltrated every relevant institutions of Egypt: not only the army, the police and the media, but also colleges, coffehouses, powerful families, etc.
See Leadership and Allegiance in the Society of the Muslim, Brothers by Lella Landau-Tasseron, for more details on the secret organization of the Brotherhood
The mission of the Caliphate and the extraordinary organization of the Brotherhood were derived from the "prophet" muhammad, his companions and a few subsequent caliphs. Following this model, al-Banna had his organization adhered to the guidance of Umar, the second caliph, who had said "there is no islam without a Society of Brothers, no Society without an Imam, and no Imam without complete obedience."
Umar went on to become the organizer of the greatest of the early islamic conquests, and of a Caliphate that had endured for a 1000 years...
Al-Banna followed that model when he crafted the Muslim Brotherhood. So Egypt will turn out exactly like Iran.
I don't say the Brotherhood will stay 1000 years in power, but it will stay much longer than most people seem to think.