I don't see the comparison between beltran and Melo at all.
Beltran is an excellent player who had a nationally televised series for the ages, and thereafter, NY media and Mets fans thought they were getting Ruth/Gehring/Mantle/. He was, very very good, but couldn't replicate (nobody could) that series, and as such, mets fans faded on him.
melo - many talk about 'getting him help". seems to me, he's shown to be very, very hard to put people around him. seemed jealous of Lin, made clear he didn't want the PNR (making an even healthy Amare impossible to pair him with), hated MDA, so, for those who champion him as the centerpiece to 'put some talent around him", who do you have in mind? seems to me, melo has rejected outright varieyt of people/styles/coaches, so, i disagree with the keep him/build around him strategy