I'm not sure of the context behind what Dawkins says but it sounds like he is bemoaning that there are specialist areas within philosophy. Presumably 'continental philosophy' covers the likes of the Vienna Circle (Logical Positivism and Carnap et al) as opposed to, say, those who focus on the pre-Socratics.
Other disciplines also have specialist areas, and no doubt Dawkins is very familiar with these in relation to his own specialist area of biology, so I wonder what his objection is in relation to the same being the case as regards philosophy - does anyone know what his problem is?
I wonder too how actual philosophers, which Dawkins isn't, have reacted to his observation.