From the start it was clear that Syria and Iran wanted ISIS (Daesh) to develop even if they don’t have direct control over them. It is the best way of making chaos in the Sunna regions.
Then there is Turkey, using Daesh to fight the Kurds and weaken them, weakening the PKK is a main objective. Turkey also has hegemonic ambitions in the region as does Iran.
Finally, the USA is not as anti ISIS (Daesh) as many suppose, it is a useful tool to weaken the overall power of the governments in the region, but ISIS (Daesh) must not be permitted to become too strong itself. USA is interested in making a new balance between Sunna and Shia.
Turkey will become the new dominant Sunna power instead of Saudi Arabia (KSA), their collaboration with Daesh and relationship with the USA indicates this.
Jordan will at some point take control of south Syria, using the rebel Syrian brigades in that area.
Iran is not a religious state as many believe, they simply use religion as a form of control. It seems the new balance the USA wants to create is between Turkey and Iran, the gulf states will become less relevant, particularly as USA and Canadian oil and gas output increase.
As for Israel, it has good relations with Jordan, Egypt, UAE and KSA as well as strong back channel communications with Iran.
This article is based on my own personal experience of the Middle East as well as conversations within the intelligence community.