TV Rights and sports industry
Serbia is a little country.
I Think it's very risky that the ATP are willing to put the futures of tennis in the hands of 2 players.
I know it's all business move after all and don't blame them for it entirely either. Still they shouldn't treat one of their top dogs like the way they have done to Nole, if they're smart enough. Probably Serbia isn't a desirable country though, Nole himself has the potential to become a world wide star and won't go away anytime soon, then it's their charge how utilize what they have.
To me, they seemed to want him to take the role of the villain which Nole refused to be, so just gave up trying in other ways. Let's see how they deal with the new situations from now on.