As part of the US Oil renaissance I foresee Saudi Arabia either breaking internally or externally (through Iran and Russia war). US will have no benefit in assisting their one time partner as the US is seeking the Saudi Arabia crown of being the world's largest oil producer/exporter. Without the US military assistance Saudi Arabia is really isolated amongst Russia, Iran and even Israel. I forecast the House of Saud will collapse within 2 years. You can see the breaking of the Petro-Dollar alliance already with Saudi Arabia increasing production (slashing oil prices) to crush US shale production. You can also see it in the US recently approving the lifting of a 40 year old ban on US domestic oil exports. The US is building massive export ports and lastly Oil production of the US has drastically increased. Saudi Arabia were fighting the oil price war on 2 fronts: US and Russia. The main difference is that Russia/ns are more resilient to harsh economic times and geopolitically there have deeper diplomatic and strategic ties than Saudi Arabia. Saudi Arabia will lose the "Oil War" either way... Through internal, external or be the first to flinch and reduce production.