MbS not only has a problem with his relatives that want to have a part of the income from the oil, like Prince Khaled bin Farhan above, but as well from the Wahabbis and the Salafists. in the below long article the threat from al Qaeda is described:
Al-Qaeda believes that if they can persuade even a few younger radical clerics to accept the call, a break between the clergy and the House of Saud could pave the way for the regimes collapse.
In addition we should add the bad financial position of KSA https://ameinfo.com/money/economy/saudi-oil-price/