The countries in the region will need to do something about ISIS and fast. These guys are efficient and ruthless. They take no prisoners and the prisoners they come across they promptly execute. If unchecked, they will expand even further than they are now.
They just released their expansion plan on Twitter
These guys want to create an Islamic Caliphate that spans from African to south east Asia. Mind these guys are a bit nuts to think they'll be able to do this given the military resources outside of the destabilized Syrian and Iraqi areas, but it does highlight they have huge territorial ambitions that will be a problem if they are not checked sooner rather than later. If something isn't done about Syria or Iraq current weakness, there are very broad implications on the entire Middle East, people within and a lot of other global problems.
This is what they are seeking to create in the short term is a state carved out of both Syria and Iraq, and they've made huge strides in doing so already.
Past ISIS expansion plan map

Current range of ISIS and oil fields contested
Vox has a great article on the background of ISIS including their origins as a break-away Al-Qaeda franchise.
http://www.vox.com/2014/6/13/5803712...aq-crisis-isis
EDIT: Didn't realize morale and training in the Iraqi armed forces were so bad.
It's no wonder they are getting their a*ses handed to them.
Quote:
Iraqi officials told the Guardian that two divisions of Iraqi soldiers - roughly 30,000 men - simply turned and ran in the face of the assault by an insurgent force of just 800 fighters.
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http://www.theguardian.com/world/201...tes?CMP=twt_gu