We also have no central body to organise, and run itjihad. In the past, the Calipha was responsible for the ummah (muslim people) and the direction of the faith. It was the calipha who organised, and chaired the itjihad. Today, to mention the word calipha in any arabic country will get you killed, and to work towards a caliphate in the middle east will have you labelled an extremist.
I cant see why this is necessary. Why cant scientific innovation take place without this? For 200 odd years the UK was at the forefront of scientific discovery but it was more about individuals working by themselves rather than some centrally organised system and certainly little to do with religion.