Besides...
Besides; the Quranic Verses too have given expression to this end in its several chapters. Muslims also have often and always looked forward in anticipating the realization of the goals in line with the promise committed by God and His Prophet.
Furthermore, there are hundreds of predictions foretold by the prophet that Islam will be the absolute and universal religion and that a total justice will rule providing security over the earth; and this will be accomplished by Mehdi whose appearance is awaited as it is promised. He is from the Prophet’s progeny, son of Ali and Fatima, bearing a patronymic same as that of the Prophet. One day Mahdi will appear; this belief has been introduced, that is, the specifications too are told.
This is a belief that runs in the veins of Islam and is divulged in its preliminary texts. Besides, the traditions those are constant - and are their constancy runs no doubt - support the belief. The Prophet has given the tidings and it is he who has kept his nation in waiting for the day of the appearance of Mahdi. This belief, as other ones, is a principal and cardinal one envigoured by its originality and enlivened by its purity. The belief in the Prophet resigns to the belief in Mahdi.
Extract from the traditions has not constituted this belief. Prognostications that Islam will become worldwide and that the truth will obliterate the wrong, do exist and do provide an umbrella, but this belief stands by its own supported by the text. Symptoms are foretold and the qualities specified which are to be taken for granted when they occur as the indication of Mahdi’s appearance.
These predictions might have had been efficacious in the growth of this belief but the conditions and circumstances that came into being immediately after the death of the Prophet have not part in this belief, because this belief had already been divulged to the people far in advance. The origin of this belief is the prophet hood and not the time. Likewise, attachment of the faithful ones with the Prophet stands apart from the count to be regarded as one of the causes for Mahdism.
Such a conjecture, if there be or to form one, is doomed to be rejected and refuted because it is bleak and barren; not an evidence nor a proof, nor a document, nor a logic is there to irrigate it so as to keep it alive.