By all means, let all the Americans and other Westerners leave Saudi Arabia. The whole place will shut down within six weeks, and they'll be begging us back. Why, you ask? Because work is beneath the lofty Saudis, and everything the least bit technical is done by outsiders. Wait and see....
One of the most bizarre things I've ever seen was the shadow workers managing the hotel I stayed in Damman in the "kingdom". A Pakistani hotel manager does all the mundane things like checking people in, while the haughty Saudi natives sit in the office and drink tea and eat dates. Then there's all the slave labor out in the 125 degree weather building roads. I don't ever want to go back there.
Not an option, because if we leave the Saudis will just replace us with Asians. The newbies may not have the benefit of prior experience in the Texas oil patch, but five of them can be had for the cost of one of us - and they will no doubt learn as fast as they have in every other field of technology.
Wealth is created by trade, not by isolation. We have no choice but to stand and fight. Let Saudi Arabia be the next battleground.
Pressure must be put on them from the military side. They certainly do not have to sell oil to the USA, or even Europe.