Nobody is ever going to unify Arabia under any caliph. Why do you think the Saudis support the rebels, because they want al-qaeda to overthrow them and establish a cliphate? Wrong. That will never happen. You think the King of Qatar wants to be overthrown by a caliph? Pure fantasy.
People in the Mid East routinely make mistakes that could have been foreseen beforehand. Maybe the desert air makes people stupid. Why did the Shah push liberalization despite the wishes of the average troglodyte Iranian, leading to his overthrow? Why did Israel push a Palestinian state despite the PLO's bloody record, and support Hamas against the PLO for much of the 80's and 90's? Did the Gulf royals support al Qaeda because they though al Qaeda would attack us on 9/11, thereby causing the American public to view Gulf royalty with a mixture of contempt and genocidal hatred? None of these things were foreseen, and yet they were foreseeable.
The problem with Gulf royalty is that they are like medieval Catholics who liked to sin and then instead of repenting, bought indulgences in order to palliate their guilt. Except the Gulf royals behave like the infidel in non-Muslim countries and salve their consciences by sending their nutcases abroad with suitcases of cash to kill the infidel, and proselytize among the foreign Muslims who are not already nutcases so that they do become nutcases, while handing out money like every day is both Eids rolled into one.