I don't think people are advocating trading him because he's a bad player... just that it's something to talk about given the emergence of Biyombo in these playoffs, the fact that there's no chance they could keep them both, and whether the downgrade on offense from one to the other is worth the defensive upgrade, the potential money savings, and the possible return of a very valuable asset that could make the team better.
I don't know what I would do, to me it looked like JV was emerging defensively prior to the injury (not on Biz level mind you) and he already has the offensive game and ability to shoot free throws.
Problem is, Biz is a free agent after he declines his player option, so you could possibly lose him for nothing. Raps dont have his bird rights so they have no advantage over any other team in signing him.
It's worth having the conversation if the Raps are better with Biyombo starting with Nog backing up plus the potential trade return for JV, or JV and Nog with Biyombo just gone.