Serbia hasn’t got the forces to retake Kosovo even if it wanted to. No Serb administration is going to go down that path.
Serbia is in the process of rebuilding itself, and in the next 75-200 years the time will once again present itself when Serbia can re-take control of its southern province.
In the meantime there are great documentaries like this one, and other wonderful Serbian myths to pass on to future generations of Serbs that will assure that not only will Kosovo remain Serbia, but in the future there will be no chance of another land grabbing attempt by the Albanians.