I was trying to say.....

Serbs    v Croats and Muslims
Serbs    v Muslims
Serbs    v Croats
Muslims   v Serbs and Croats
Mulims    v Croats
Croats    v Muslims and Serbs

To pick up Q's point, Turkey was losing its grip in Europe long before WW1 - hence the ceding of BiH to the Dual Monarchy in 1878. In any case the mis-match between national boundaries, ethnic demographics and geography was calculated to foment instability whoever was in charge.

Tito gave the region its best shot with 45 years of stability and economic growth. He ruled with an iron fist for sure, but only in the interests of "brotherhood and unity," and unlike most other communist rulers he allowed religious freedoms.

It was the hiving off of the "profitable" bits of Yugoslavia (Slovenia and Croatia) that left Kosovo high and dry, as such secessions would do to any country. It also left the rump of Yugoslavia with an unmanageably dominant Ssrb majority - and thrust independence on BiH which, with a narrow Muslim majority, was plainly unsustainable as a sovereign state. (What other country in which 40-odd percent of the polulation was actively Christian, would settle amicably for majority Muslim government?)