There's trouble afoot in both Saudi and Egypt.
Saudi is an anachronistic monarchy which will (I agree with LAN) still continue but anyone's guess is as good as mine for how long. Islamist factions within the country are restless (Bin Laden was/is one of their representatives) and a country that imports most of its labor from the poorest countries of the world so that its sons can barge around the desert in luxury 4 x 4s and live in A/C mansions while the working population dwells in shacks, well you want a picture of imminent disaster painted, here it is.
Saudi is not homogeneous. Whereas the royal family has the dimensions (in numbers) of a mid size American or European town and the other Arabs that can claim origin in the "Rub al Kali" have it made as long as they have the ear of one of the royal family members, the whole bunch is vastly outpopulated by the modern wage slaves.
"Saudi" Arabia is a misleading name anyway. All it denotes is that the place is run by the Saud tribe (it used to be run by the Hashemites who now comprise the Jordanian Royal Family).
Only thing that keeps the ibn Sauds in the seat is Oil and the money it brings that can be spread lavishly amongst the population (foreigners excluded). The foreign power that initially most needed the oil and did the most for its exploitation and thus (by default) created the most wealth for the country is the US.
They are also the most hated.
The whole Oil thing brought a country with medieval (and totally archaic) hierarchical structures from a situation of owning nothing but sand to the hi-tech age. Well a lot of money has been invested in sending the royal sons to Harvard and Princeton and Cambridge and Oxfor and MIT and elsewhere, so that the soul of the country may follow the purses filling at a gallop, but that didn't achieve much in way of arriving in modern times.
It is perhaps to be noted that decline of the area set in almost immediately after the Prophet and his followers rode out of the desert. Cultural centers henceforth lay to the North in Damascus, Baghdad and, yep-not far from me-, Cordoba. The seats of the Caliphate (Caliph being the supreme worldly and spiritual leader of Islam society).
The Crusaders were fighting the Turks, not the Arabs, Salah ad-Din was Kurdish (from Iraq). Nobody, but nobody ever saw reason to return to the Arabian desert.
Take, at the same time, Oman. Take what is now "the emirates". Take even Yemen. Traders. merchants, fishermen, pearl farmers, jewellery makers, incense growers, silver smiths, navigators etc. Open to the world, broad minded, highly skilled and educated by multiple cultures. They were the ones who brought Islam to such far away places as Indonesia and the Philippines by sea and Eastern China by land.
From the Rub al Kali came nothing (after the Prophet) and nothing trickled back for centuries. It was just a vast expanse of sand very much in the way of Red Sea and Indian Ocean business with Damascus, Baghdad and places beyond.
Until we needed their oil and initially made some feeble attempt of bringing them into the 20th century by giving them trinkets. Well they never even reached the 13th century.
And by majority they hate us but they hate the US most of all.
This has gotten so long

I'll address Egypt some other time.