I'm not worried about Saudi sell off of US assets. Big whooptidoo. If the assets have value, they'll have just as much value in the hands of someone else.
While I'm convinced of some amount of complaciency by the Saudi government (the Saudi family is now massive, and certainly one or more princes is a bad egg).... the problem I worry about is, what happens if a far worse government replaces the Saudis?
The US has a long history of failing to hold strong to a goal internationally.
The Shah of Iran, may not have been a perfect solution, but can you say it's much better now?
Clearly we didn't stay in Iraq long enough for a government to take hold, and maintain authority.
We ditched South Vietnam, and allowed their people slaughtered. Thankfully today they are non-issue.
If we destabilize the Saudi government... What happens if a radical government like we've seen elsewhere, gains control of the vast oil wealth of Arabia?
And by the way, a radical government is nearly the defacto outcome if we lose the Saudis. The largest and most powerful concentration of religious power, is the Imams of the most holy places in Arabia. If the Saudis fall... the Imams will take control, I can almost guarantee that. It will be the most radical Islamic government to have ever existed.
I have thought... could be wrong... but I have thought that the fall of the Saudis would be the precursor to world war 3. A radical Islamic government in control of the energy supply of the entire world, combined with a dangerous Iran engaged in proxy wars, backed by Russia. Bad combination there.