I don't think that Daesh has a leader strong enough to unite the Arab lands without at least a hundred years of civil war. I mean, they want to be a new Caliphate but they lack a Caliph who would be able to unify the lands they've conquered, and in this interconnected world as soon as a leader did present himself then they would receive a Hellfire missile for breakfast.
It's very hard to be certain what direction Daesh will take, and if in the long term they are actually the major story in the Middle East or just an offshoot of the changing power balance between Saudi Arabia and Iran and the waxing and waning tide of Western power in the Middle East over the past century.
In regards to the 'global security system' which sounds like something from Command And Conquer, I'm guessing that you mean something like NATO? I can't see NATO or the US/Western Europe alliance splintering any time within the next fifty years, although I can see a lot of disagreements brewing about how Palestine and Israel should be treated, and whether Iran should be trusted, etc. Turkey as well is going to be a big question mark for the western powers, whether its strategic importance is worth the trouble that it's causing the west.
However, since Russia is once again perceived as a threat, China (despite its economic problems and indeed perhaps because) is also perceived as an ongoing concern, and Daesh and its radical Muslim allies treat all westerners as fair game, the western nations aren't going to split apart when they are all potential targets.
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