VK did just one thing: he beat Miloshevich in an election that was heavily subsidized, indeed, bought by American money.
Besides, the executive power rests in the office of the prime minister, so regardless who the new president of Serbia is, Djindjich will still call all the shots. In that respect, I can fully understand why VK may be reluctant.
BTW, VK did not keep Yugoslavia together. Yugoslavia lasted this long not because, but in spite of Koshtunitsa. And, Koshtunitsa was a president of a fictitious land called Yugslavia, a pretend country, indeed a sharade, which Neboysha Malich, in his eloquent wisdom, calls the "un-dead." This living corpse has not been a viable country for a long time. Podgoritsa was ignoring Belgrade's decisions with unchecked liberty -- from introducing separate currency to not recognizing the federal government.