There's an English version of al jazeera, where the anchors and reporters speak English and broadcast to the English speaking world. I doubt speaking Arabic is a necessity to work there.
Point taken, but a) they've already got plenty of good anchors, and b) many of the anchors (and all of the reporters that I've seen thus far) seem to speak Arabic as well as English, and can therefore do things like talk to people on the street, understand government broadcasts, etc.