Daniel's vision of worldwide terrorism was preceded by a vision of an Islamic Revival. It was followed by a vision of a terrible beast.
The terrible beast is an empire that dominates the entire world.
The fourth beast is a fourth kingdom that will appear on earth. It will be different from all the other kingdoms and will devour the whole earth, trampling it down and crushing it (Dan 7:23).
Modern terrorism is very difficult to control and is often used as a justification for central governments taking power for themselves. Following 7/11 and 7/7, many governments have passsed anti-terrorism laws that give them tremendous powers for use against enemies of the state. The most serious consequence of terrorism will be an enormous increase in state power. Worldwide terrorism may be the catalyst that brings for the Terrible Beast that Daniel saw in his vision.