Haslem would be a great pickup from a talent perspective but considering the C's only have the MLE and vet min contracts available, Haslem is not the player they'll go after.
The C's have a bigger need at back up SF and PG that they should be addressing with the MLE before they start adding to their frontcourt (which they have 4 players under contract for those spots already).
As a player, he'd be a terrific addition for any team. It just won't be the C's next year.