I subscribe with the amir views, it's not just his production, his whole presence on the court, he seems like he's not 100% committed. Not sure if it's frustration of some kind, but I remember he was pretty bad early last year too, before coming along in the second half of the season after he got promoted to the starting unit.
I don't have a problem with benching either one, never bought the argument that you need to start in order to develop. And JV may get more touches with the second unit, which may actually be better for him. Whatever the fault of the coaching stuff is, JV is not doing too good now and a wake up call may help too.