That's the problem with the "it's far from our beds, they can do whatever" mentality. This instability, especially it it ends up affecting the entire region ultimately has a negative influence on the whole world. It will make for an even bigger breading ground of extremists with new generations to follow, that despise our way of living and they will try and commit attacks in the west whenever they get the chance just to prove that point + it will also affect oil prices. And those are only the negative effects for us westerners, not mentioning the millions of people that could suffer under this over there.
Just recently one of those ISIS affiliated jihadists that fought in Syria took his Kalashnikov and shot 4 people in the head in downtown Brussels. They only caught him when he got off the bus from Amsterdam as they were checking for drugs... A sign of what could follow if this keeps on escalating.