Every civilization is cyclic, like an organism, as Spengler said, and in the same way that you can't expect to be youthful forever, you can't expect Greeks, Indians, Arabs, etc to have their "Golden Age" for billions of years.
When Muslims were laying down the foundations of algebra many nations which would produce the world greatest scientists to come barely knew how to write their name. The Jews, probably the single ethnic group which was the most seminal in the advent of the modern world - in science and technology, but also arts - didn't have a single contribution during the European Middle Ages.
The issue is not so much with the Muslim world, but more generally with the transfer of technology to the "Third World" - the "Hindu" world isn't that much better, while the "Sinic" civilization is only reclaiming back its prestigious place.
You also have to keep in mind another data, simple but essential : demographics. As Ehsan Masood said, not only the median age in the Islamic world, as compared to the West's 45, is of 25, with some fluctuation (in Gaza, 15, and the highest in Tunisia, Turkey and Iran, 29-30) - how many "top class" scientists have you seen being 25 ? -, but, especially, because those are the first generations to go through scientific education ; their parents, barely getting out of colonialism, were children of peasants, and thus the only choice was to either become doctors, lawyers or engineers, that is,"economically secure" professions ; now, the very same children of these doctors, lawyers and engineers, are already economically secure, already have a cultural capital, so their own children can go into "pure sciences" like mathematics, physics, ... but also humanities.
It's a complex phenomenon which takes time. Look at Russia : one of their leading philosophers, Chaadayev, in the 1850 (not 1750s, not 1200s, but just 200 years ago) said that Russia was a "cultural catastrophe" because "it never contributed to world civilization" - but at the very same time he said this, Russians were going to the newly founded universities in St Petersburg and so on, and would give, in a matter of decades, the Lomonosov and all, eventually cementing Russia that most scientific Asiatic country, with Japan (who themselves made the reforms during the Meiji era, around the same time). A bit later, we all know how scientifically advanced the Soviet Union was.
Of course, if Pak paindoos keep voting for Sharifs and Zardaris it will take some 10 000 years more.
