Therefore, why are the brotherhood groups succeeding now in the Arab world when they have been around since the 20s?
From a cursory examination of the history of the Arab world, it could be argued that it has gone from one end of the political spectrum after the post-colonial period of the 50s and 60s, to the other extreme in the 80s and 90s. Hence, the rise of Ikhwan is the outcome of that experience - it represents stability.
The post colonial era witnessed the rise of socialist and nationalist types of groups. Godless Arab socialism never really took off in the religiously conservative Arab world, and Syria has the last Arab socialist regime in name that is struggling to survive. The failure to unify the Arab nations over Palestine and the disunity shown through the two Gulf wars has also sealed the fate of Arab nationalism. During the 80s and 90s, the rise of the radical Islamic groups was inspired by the Iranian revolution that brought Ayatollah Khomeini to power, and subsequently the Jihadi-Salafee types of movements began to surface in the Arab world; the FIS in Algeria, the Taliban and Al-Qaeda type of movement in Saudi, Yemen, Somalia and Afghanistan. But, the appeal of these groups has waned post 9/11 and the Arab Spring has reinforced that view.
Using issues like Palestine, Bosnia, Chechnya, the radical groups may have appealed to the Arab masses to some extent, but their intolerant and puritanical approach to Islamic law, coupled with the escalation of violence through suicide bombings and the subsequent reprisal from the West has left them isolated. With the exception of FIS in Algeria in the 90s, their ability on the political front to rally the masses has been non-existent, partly due to their ideology of denouncing anyone who does not comply with their views.
Indeed, puritanical radicals will always be representatives of the like-minded fringe and dismissive of the rest, whereas the Brotherhood has evolved into a serious progressive movement for the masses, which recognises diversity and the responsibility in catering to the nation as a whole, which is diverse.
The Arab masses desire a democratic government that is free from nepotism, corruption, and is accountable; they want a society like that of the West where the rule of law prevails, and opportunities are based on merit. Whilst they desire material comfort and the technology of the West, concurrently they want to maintain their tradition, culture, and religious values. This is reflected in the rejection of radical models proposed by the Al-Qaeda type of groups who are obsessed with penal codes and women dress codes, denouncing any dissension and waging war recklessly.
Now that Mursi has been elected, he faces many challenges. There has been much criticism and rightly so, about the Egyptian Military declaring itself as an autonomous body with legislative powers and in charge of its budget. Its early days, and in time the trust gained by the military may lead it to relinquishing its power. One should also remember, had the military turned on the masses in Tahrir Square, the situation would have been different.
Egyptians are politically divided, as was reflected in Morsi's narrow victory. The liberals and the Coptic Christians voted almost in equal number for Ahmed Shafiq, Mubarak’s last Prime Minister. Hence, the effort to build bridges and gain their trust has begun; Mohammed Mursi declared that he is a President for all Egyptians. Some have suggested that appointing a Coptic Christian in the government would help to curb tension with the Copts and gain their trust; the Coptic community has been living there for centuries peacefully, with their Arab Muslim brothers.
The revolution has adversely affected the already failing economy; approximately 40% live below the poverty line and unlike other Arab nations, Egypt lacks rich natural resources and has the largest population in the Arab world. The new government will need help from external sources, the West, the rich Gulf nations and China. Thus in the interest of Egypt and promoting stability, Mursi has declared that he will honour all the past agreements, which includes 1971 treaty with Israel. These agreements can be revised in the future, if the government proves to be successful in bringing about internal economic and political stability. Only the foolish would suggest a confrontational stance, before you declare war, remember to prepare for war.