I'm a Horde player and I don't give a shit about it. Why you should?
The Warchief position is the biggest attention-pulling garbage on the entire Warcraft franchise. Whoever is gonna sit there will be hated for some reason. Sylvanas is the only exception because, ironically, she's one of the most developed characters and had already her number of fans and haters, as a character she's extremely polarizing (well, except for those few assholes like me who doesn't care about her either way) so no Warchief position ain't going to change anything.
Zandalar isn't down, it's just sinking. Think at Venice, but on a higher rate.