I don't think Blizzard is capable of writing a convincting conflict to justify the draenei's and tauren's part in picking sides. Lately, if they want to make a faction or allied race side with horde or alliance, they just make the other one behave in a mean way.
For example, vulpera siding with horde because "they helped them". I main a dwarf and admittedly I did not help the vulpera, so what? I did not slaughter them either. At least the massively cringy "vulpera purge squad" got scrapped afaik.
Or that one time when Thalyssra forgot about me being exalted with her people just because Tyrande told her baddie things.
I will forever be sad to see the tauren dragged around fighing a war that is not theirs anymore, but it's still better than having Blizzard putting their hands on it if these premises are anything to go by.