1. Between now and 2030, War on Terrorism drags out, fuel prices start to rise, a civil war erupts in Saudi Arabia, the US and EU intervene on the Saudi royal family's behalf against the Al-Qaeda led insurgency in Saudi Arabia. The cities are avoided, the West just occupies and defends all the oilfields and installations, de facto annexing them. China for first time openly backs the EU and US, their explosively growing economy demands more and more oil too.
2. around 2030-2040, Oil dependency diminishes greatly because of practical (unlimited) hydrogen based energy sources, transport uses hydrogen now, nuclear fusion reactors are replacing the fossil-fuel reactors and nuclear fission reactors. This instantly makes the Middle East strategically unsignificant. The US, EU and China remove their massive military presence in Iraq and Saudi Arabia.
3. After 2040, Hydrogen based economy creates wealth for everybody, the gap between the rich and poor is dramatically reduced, hence popular support for Al-Qaeda and other revolutionary fanatic groups evaporates. World population growth also stabilizes and even starts to shrink. The Third World no longer exists as such, it can modernize quickly because of the cheap and abundant hydrogen. Corruption worlwide is at an historic low, democracies at an historic high. With hydrogen powered space-planes, people can travel from Europe to Australia in 3 hours. The costly (energy-wise) water desalination process is now not so costly anymore, give everybody access to clean drinking water, avoiding conflicts about water. Most, if not all local conflicts just wither away.