I would trade for Melo, even though he's been a shade of his former self, for the chance he refinds his love and enjoyment of the game outside NY.
It would be very low cost compared to Melo's value a few years ago so I think it's worth the chance.
Of course Vonleh isn't the starting PF I would want with this team but he could maybe be a solid fit being a decent defender (which would be a weakness) and a player that works for others (setting screens etc) and doesn't need the ball.
Back to the topic, trading for Melo could seem crazy. He's been washed out for so long. But knowing Phil Jackson wants him out (which I understand) we could get him cheap and maybe be able to conform him and get him back to being a positive basketball player, which he hasn't been with the Knicks.
It's a bold move but if I'm the GM I'd do it