? I can't follow your reasoning at all.

_{*Lunatic*, n.
One whose delusions are out of fashion.}

Well you certainly have seen some data here:
http://en.wikipedia.org/wiki/Demographic_history_of_Kosovo
While with Bosnian Muslims it's not easy to distinguish who is who ( for outsiders) because they speak Serbian /Croatian only and their names are very often same as Serbian/Croatian with Albanians it's different story. They of course speak Albanian (and all though they used to learn Serbian at school one can always recognize them through their dialect except if they lived elsewhere in Serbia).And their names are not Slavic, so it's easy. Then again in Sandzak you have again Muslims of Serbian origin and language. If one cares to do it it's not hard to differentiation course Albanians are majority now on Kosovo but how is the story going with some USA parts where English is not even language in use anymore? End even closer to home Europe is soooo troubled that ethnic principle is not even considered to be used...