While I love them I have to agree with FamilyMan. They should have been removed more from the series. I see at least one of them in each episode, and it's kind of old now. I think the new actors were sufficient enough with their stories to fill in any gaps left by the old ones.
Besides, the new characters did freshen it up...but only for so long. What are they going to do when House gets rid of them? You can't fit all of them in all of the time.