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 regime’s collapse.
In addition we should add the bad financial position of KSA https://ameinfo.com/money/economy/saudi-oil-price/
Long and informative article about MbS (would this be a draft for an obituary?)
Through such a highly selective anti-corruption campaign, Mohammed’s kleptocracy has nonetheless accomplished several goals. It has disempowered many of the economic elites and their Al Saud allies and expropriated their sources of income. Detaining several media moguls and investors, Mohammed has privileged his family’s own media company and controlled the narrative coming out of Saudi Arabia. He has also shattered notions of consensus as well as the long-standing balance of power within the top ruling members of the monarchy. While the latter may not have been able to prevent the crown prince from taking the throne, they could have presented many obstacles to the centralization of his power and governance in general. Most tragically, the regime has succeeded at what every Saudi regime has historically done best: terrorizing a whole population. Yet again, people’s political aspirations, let alone dreams of leading better and more prosperous lives, will not see the light of day.
https://www.thenation.com/article/how-mohammed-bin-salman-has-transformed-saudi-arabia/
There are many tweets in Arabic that MbS is dead, but it is from sites against KSA, such as this pro-Syria account https://twitter.com/fadigaber5/status/999906085161979905