Interestingly, if this were to happen it would not lead to a media chorus insisting that it means we "lost" in Kosovo. Nobody would equate a later withdrawal with "losing" the earlier war.
The same is not true in Iraq. If/when our troops exit, everyone will insist it means we "lost" "The Iraq War".
What is the difference, you ask? I mean, besides the letters that go after the names of the respective Presidents who initiated these hostilities? Well... there is none.
3,500 dead American servicemen. That's the difference.
There's plenty to argue about both conflicts, but to say that Kosovo was "won" in the same sense Iraq was "won" is simply delusional.