Several factors may impact al-Qaida's rise or decline over the next several years. Most of these are outside of al-Qaida's control, but much would depend on how al-Qaida or similar groups responded to them.
Al Qaeda in Syria cut ties with its parent organization to portray itself as a legitimate, capable, and independent force in the Syrian civil war. The group appears dedicated to helping Syrians prevail, and now that ISIS has lost its capital in Raqqa, al Qaeda may be the only group viewed as militarily capable of challenging the Assad regime.
The future of the global jihadist movement is likely to resemble its past, with groups of militants dispersing to new battlefields, from North Africa to Southeast Asia. The Islamic State could become even more dangerous and challenging for counterterrorism forces, as its splinter groups threaten renewed and heightened violence throughout the globe.
With ISIS's caliphate in ruins, one of its affiliates could grow to become even deadlier and more capable than the core organization was during its peak. And with franchise groups and affiliates across the globe, there's no shortage of contenders to supplant ISIS as the world's most dangerous terrorist group.
Policy decisions are being made based on the assumption that the Middle East is riven by a purely dualistic sectarian war between Sunni and Shi'a Muslims. While sectarianism is relevant, geopolitical competition, local disputes, and political rivalries are the core drivers of conflict in countries like Iraq and Syria.
The persistence of al Qaeda and ISIS underscores terrorist groups' adaptability in the 21st century. Both organizations maintain global, regional, and local influence in the face of immense pressure. As terrorist groups fall, the West should watch them closely to prevent a resurgence.
Since its founding, the Islamic State has consistently expanded and contracted in order to achieve its objectives. To discern how ISIS might continue to expand, it makes sense to trace Al Qaeda's trajectory, which followed a similar pattern in the 2000s.
Developments in the Sahel are cause for alarm. Despite the presence of an active French counterterrorism force and a UN peacekeeping mission, al Qaeda groups are thriving. The region would benefit from approaches that combine police and military operations with economic development and improved governance.
Al Qaeda's revival will likely hinge on its ability to take advantage of opportunities such as the withdrawal of counterterrorism forces from key battlefields, more revolt in the Middle East, U.S. or European policies that feed the perception of Muslim oppression, or the rise of a charismatic jihadist leader.
As operations against ISIS in Mosul conclude, militants are likely already fleeing—and preparing to wage jihad elsewhere. How can the United States identify and mitigate the threat posed by these foreign fighters?
As ISIS loses territory in Iraq and Syria, are terrorist attacks more likely or less? How is the group evolving? What about al-Qa'ida? To answer these questions, RAND convened a group of terrorism experts.
The Trump administration faces the choice of losing quickly by withdrawing from Afghanistan; losing slowly by maintaining America's current, inadequate commitment; or not losing by increasing that commitment enough to maintain a stalemate on the battlefield.
The Russian military announced that it might have killed the leader of the Islamic State, Abu Bakr al-Baghdadi, in an airstrike in Raqqa. Would his death weaken the group or will ISIS continue to adapt, evolve, and expand like al Qaeda did?
The number of attacks like the one on London Bridge are low because jihadist ideologies have failed to gain traction in most Muslim countries, and it's difficult to recruit people remotely. Supporting violence and participating in it are two different things.
In the past 50 years, Yemen has faced significant political instability, including multiple civil wars. Why might Yemenis reject political violence despite persistent conflict and unrest? And how can the United States and its partners undermine violent extremism?
Afghanistan remains a key frontline state in the struggle against terrorist groups. With that in mind, the United States should make Afghanistan and neighboring Pakistan an enduring part of its counterterrorism efforts.
As Russia gets more involved with the Syrian civil war, it's likely that Sunni militants will intensify their campaign against Russia. But the key reason why Sunni attacks on Russia proper will increase is the fallout between Sunni jihadists in the Caucasus.