Will the Jesuits succeed in enslaving all mankind?

No more then any other religious group.

ALL OF MANKIND is a very vague, arbitrary and capricious notion.

Well, not all mankind; a Billion Hindus, a billion Buddhists and a Billion Muslims seem to have escaped. But the correct answer is because the Jesuits were the police arm of the Catholic Church. You may have read of their adventures during The Inquisition.

Oh, wait! I misread the question, thinking it said "why did...".

Will they? No, they can't compete with the internet. That Beast will get most of us, especially once everything gets wired into the "smart grid". Weird thing though; somewhere I read only 144,000 remain pure. That's a pretty small number on a planet with almost 7 Billion Souls on board. So I guess the bar is pretty high.

The Society of Jesus (Latin: Societas Iesu, S.J. and S.I. or SJ, SI) is a religious order of men called Jesuits, who follow the teachings of the Catholic Church. Jesuit priests and brothers — also sometimes known colloquially as "God's marines" — are engaged in evangelization and apostolic ministry in 112 nations on six continents reflecting the Formula of the Institute (principle) of the Society. They are known in the fields of education (schools, colleges, universities, seminaries, theological faculties), intellectual research, and cultural pursuits in addition to missionary work, giving retreats, hospital and parish ministry, promoting social justice and ecumenical dialogue.

The Society was founded by St. Ignatius of Loyola, who after being wounded in a battle, experienced a religious conversion and composed the Spiritual Exercises in order to help others to follow Christ more closely. In 1534, Ignatius gathered six young men, including St. Francis Xavier and Bl. Pierre Favre, and together they professed vows of poverty and chastity, and then later, obedience, including a special vow of obedience to the Pope. Rule 13 of Ignatius' Rules for Thinking with the Church said: "I will believe that the white that I see is black if the hierarchical Church so defines it". Ignatius' plan of the order's organization was approved by Pope Paul III in 1540 by the bull containing the Formula of the Institute. The opening lines of this founding document would declare that the Society of Jesus was founded to "strive especially for the propagation and defense of the faith and progress of souls in Christian life and doctrine." The Society participated in the Counter-Reformation and later in the implementation of the Second Vatican Council in the Catholic Church.

The Society of Jesus is consecrated under the patronage of Madonna Della Strada, a title of the Blessed Virgin Mary, and it is led by a Superior General, currently Adolfo Nicolás. The headquarters of the Society, its General Curia, is in Rome. The historic curia of St. Ignatius is now part of the Collegio del Gesù attached to the Church of the Gesù, the Jesuit Mother Church.

I take it Jesuits are the popular religion to fear among the doomsayers these days.