The root of the issue, of course, has to do with endorsements. Nike gave Zlatan a lot of cash in order to put him front-and-center in a number of their recent advertising campaigns.
Which, despite the fact that Zlatan actually does have talent and has some growth potential, was terribly premature. Nike gambled after a good premiere season in Serie A, knowing nothing of his second-season struggles combined with a WC outing that even made Tim Crouch look endorsement-worthy by comparison.
Zlatan and his agent, however, have smoked the endorsement crack big time and believe in it -- not realizing that it was foolish marketing money on Nike's behalf to begin with. So they will continue in an attempt to try to capture that pedestal Nike prematurely, and errantly, placed him on.
Unfortunately for both Zlatan and his agent, they're going to have to realize that it won't matter whether he plays for Juve in B or Inter in A. While a good, promising player overall, he currently exhibits little of either the talent nor the leadership required for him to retain any of his high profile endorsements now that the marketers have caught on.
The great irony is that he arguably could achieve that more over the long-term by helping a club climb back to Serie A than he ever could trying to convince people with an attitude of entitlement in football's elite. The best, most sellable hero stories concern those who faced and overcame adversity -- rather than those who act as if they were born with a silver spoon in their mouths.