Most alliance races are united under the blue banner of the lion. Especially humans and dwarfs. I think the same thing should apply for the Orcs and the trolls. All troll tribes need to join the Zandalari in becoming part of the Horde. All Orc remains should join their other people in sticking their lots with the horde. Specifically the remains of the dark and fel horde. Like that the race fantasy can become finally full circle for the fans of those races. Do it Blizzard. Let the core races of the Horde be united under the same banner.