Just looking at the devastation the Horde has wrought upon Elune's most ardent worshippers, it's hard to imagine her not taking sides in the faction war when the Horde is being lead in the service of death. And yet still, the Tauren remain.
Baine seemed to sneer knowingly as the Horde set out to "Silithus" in A Good War, but he didn't stop Tauren braves, shamen and kodo riders from joining the assault on the Kaldorei either. Will the people of Mulgore still walk in Mu'sha's light? Or have they scorned her and fallen from favor?