Never watched it, but i'm willing to bet that at the very least there'll be quite a few people out there who, due to this show, got a taste of what to really expect on the day, and were therefore a better birth partner because of it.
For this reason alone it should stay.
If it was left at our NCT class's idea of what to expect, DH would have been forgiven for expecting nothing worse than something similar to a longish trip to the dentist! The focus seemed to be on petrol in the car, snacks, magazines, and remembering your phone!
(The fact that it was my 4th meant i could put him straight and he was wonderful on the day
(although still pretty traumatised!))