there can be only one superpower at a time. Right now it is US. Next it will be India, Russia or China. or all three in different phases of time.
Saudi will not be a power even in 10000 years. It is too small country and its complete focus is on religion and women only. How can it ever compete in the world of nano technology and quantum physics.
Iran has a good chance to become a regional power at best, but due to the presence of more progressive and bigger countries in India, China and Russia. It doesn't have chance to become super power in future.
only chance for Muslim representation in a super power is India. If India becomes super power sizeable Muslim population will have representation as a world power.