WI/AHC: The May Coup fails or is averted altogether?

OTL, the May Coup in May 1903 was responsible for Serbia switching allegiance, leaving the pro-Austrian camp. What happens if it is a failure, or is not undertaken at all? What PODs would realize this? What long-term consequences stem from this?
(placed in pre-1900 to allow wider range of PODs to be discussed)
 
I went with a different and proper royal marriage, and better funding for the living standards of low-ranking officers. This still leaves Serbian nationalists dissatisfied, but Austro-Hungarian politics towards Serbia and the Balkans in general were highly personalized among the Viennese elites.
 
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