From what I know, the Saudis are neutral in their stand. That's why I was quite surprised upon reading that they sent plane bombers to Syria (or was that in Jordan?). With the terrorist tag of ISIS, it is nearly impossible for Saudi Arabia to lend their support.
ISIS isn't interested in Mecca/Medina/other Saudi cities. It is rather the Shi'ites who are. This can come in a form of attacks in the eastern portion of KSA or some sort of Shia insurgency against Sunni majority. Combine this with ISIS attacks against Shia's in KSA it would be chaos which would end progress/functioning of world.
ISIS militias aren't interested in the Holey places in KSA or in any Holy Islamic land .If I would go with the article, so why don't they free Alaqsa Mosque and the Holy places in the occupied Palestine ??
The truth is they are interested in killing more people to plunder their homelands and force people to accept their disgusting laws or the beheading punishment.
As long as they have the chance to kill they'll do. So, let's rule out any attempts to invade the Holy places because they can't do that.All Muslims countries will hurry to defend the Holy places if ISIS would commit a stupid decision .
In case of the Saudis, I can say at the beginning of the emergence of ISIS , thousand of Saudis and Muslims were
sympathize with ISIS !
ISIS militias were like heroes in their eyes
But with the passage of time, people discovered the truth of ISIS because they saw,heard and read about ISIS's crimes and orientations which are not consistent with the Islamic teachings.What I want to notice is that ISIS terrorists have NO chance in Saudi Arabia anymore .