First of all, the Saudi do not want Americans out of the way. They just don’t want them protecting a bunch of infidel socialist Kurds promoting - oh the horror - democracy, women’s rights and secularism.
They Saudi endgame has always been to use US forces to fight a war against Iran - there’s nothing funnier for Saudis for infidels and heretics to kill each other. Also, without external factors (US) Iranians would win any military confrontation with Saudi/UAE hands down.
And it seems that with Jared and Trump they’ve finally hit the jackpot, praising their “ignorance” in a leaked presentation. You’ll notice that despite Trump’s “imperial retreat” the Administration is strangely focused on staying hawkish on Iran.
Trump’s retarded tweet in which he claims that Saudi Arabia will “rebuild” Syria proves how clueless him and his son-in-law are - the Saudis have poured billions into exporting islamic radicalism throughout the world in the last few decades, imagine what will happen if they’re given a free reign to “rebuild” a country? Basically a rebranded ISIS caliphate.
Which brings us to the second point, that’s also a sunni vs. sunni fight - Turkey and Saudi Arabia are vying for dominant position in the Sunni world. Sure, they can agree on some points - killing of Kurds namely - but this is the second big fight to determine whether the Sunni world will be dominated by the neo-Ottoman Empire like it was up a hundred years ago when the Ottomans ruled over the Arabian peninsula or some deranged version of the 7th century caliphate as the Saudis would like.
Also, it will be very interesting to see what will Assad do and how he’ll maneuver in this three way fight. Pretty much everyone underestimated him but the clan Assad have proven that they’re survivors. Former socialists who suddenly became religious Shiites despite being heretic Alawites a few days ago were decorating Christmas trees in Damascus.