Muqrin Replaced

Tonight's breaking news out of Saudi Arabia is that King Salman of Saudi Arabia is removing Crown Prince Muqrin from the line of succession.  I predicted when Salman ascended that this might happen, and it represents what was already implied by Muhammad b. Nayef's appointment then as deputy crown prince: that descent from the "Sudairi Seven" is the principle for reducing the number of grandsons of King Abd al-Aziz who are eligible for the throne.