Assuming anyone allows him to take the throne due to his “dubious” lineage.
Now that Abdullah is dead, Crown Prince Salman takes over. And Salman is due to be succeeded by Crown Prince Muqrin. But… “his prospects are often questioned because he was born to a Yemeni rather than a Saudi mother of “approved” tribal lineage.”
That’s burying the lead.
“At 69 years old, Muqrin, the son of a Yemeni slave girl, is the youngest surviving son.”
The Kingdom of Saudi Arabia was not declared until 1932, although ibn Saud had established control in much of the area before then. Slavery was officially abolished in 1962.