Emmm.... human can remove 1 Stun with 30 sec CD with anti-cc talent.
Orc reduces every stun duration 45% with racial + pvp talent, and they can still using Blood fury, this is >>>>> than stun removal every 2 min.
People will keep playing human in Legion because they like how their character model look (In my opinion, much better than the horde ones), and in Wotlk orc has 5% pet damage increase, 15% stun reduction and blood fury, trolls has a racial like heroism/BL, so horde losing in PvP is a L2P issue.