I'm amazed this kind of thing still went on after that famous "tear" scene in Broadcast News.
The standard staffing for a news camera crew is now one person - who does lighting, camera and sound.(*) Prior to this the standard was two people - a camera operator and a sound recordist (the recordist also often operated the portable video tape recorder in the days before camcorders). When ENG (video news gathering rather than film) was introduced there was also often a sparks (i.e. lighting electrician) in the crew as well - to safely rig and de-rig lamps. As you can see - the "people" cost of shooting news has reduced in the last 25 years or so...
A sound person is still sometimes deployed on more complex shoots where more than a pair of personal mics, or a stick mic are required, and also in some cases where safety would be an issue for a lone camera operator (though in many cases a producer rather than a sound person is sent to watch the camera operators back)
It would be very unusual - and expensive - to send two crews to anything but a very high-profile or pooled interview - so reverse questions and noddies are routinely filmed by the same camera moved into a different position (and lights also often moved), often after the interview has finished. To send two cameras and crew would cost far too much.
Locking off a second camera on a close-up is not really an option - as both reporters and interviewees often move when they talk. (You could lock off on a two-shot more readily - but you would still need the second camera, more lighting, and it would take a lot longer to set-up and feed - as you end up with a lot more tape at the end of the interview with two ISO recordings)