The structure of that conflict is America and Russia who control the two strongest states iran and saudi and they use them to collect further little slaves under their command. It saves america n russia dealing with each and every little nation, they just send in big brother of the region to control you. We are like right at the third level of the relationship and proxies for arabs who are in turn proxies themselves.
I predict Saudi Arabia is going to have to distance itself from this islamic theology wars, it is losing big time. It's lost Iraq, it's losing Syria, It's not looking good in yemen also, and hamas has gaza on lock who reports to Iran, hezbollah has lebanon on a chokehold who reports to iran. Russia and Iran axis are cleaning up house and winning this. Saudis allies left is egypt and uae basically, qatar is even gone that's how bad it is.
They have no choice but to change idealogy as this one is clearly not getting them any wins, the funny thing is what they will change too. If they come around and sing the democracy card they basically can win all muslims on their side and make Iran seem like a dictator that isn't desirable and it's allies start to reconsider their relationship.
But what that type of democracy? this approach of sending arms to cause sectarian rebellion is simply a wasted effort and America doesn't want nothing to do with it, trump recently said they lost 7 trillion there and got nothing to show for it, this religious card was used by America in the cold war to eliminate russia satellites and wane it's influence over the Islamic world, their is something to show for that, ussr is gone and eliminated but what is there to show for this crap that has been on-going since the 90s basically till now? it's nearly 40 years and there is nothing to show for it.