Let me preface this by saying that

Let me preface this by saying that I have camped Hou and did finally get the mount after no small amount of kills, so I know how frustrating it can be to be caught unawares by the grief squads on the bridge.
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That said, in all honesty, instead of thematically butchering a mob called 'The Black Wind" by making him spawn on the ground, I feel like it would've been more elegant to just get rid his pet-tankability. Almost 100% of the time he's pulled up there, it's a warlock/hunter pet doing the tanking, not a player tank and healers.

Instead of a 1 shot massive damage aoe, make the cone instead apply a dot with 4 rapid ticks for 100k apiece, As any long time pet user knows, single target dots applied by aoe are unaffected by avoidance.
Problem solved.

Player tanks take the same net damage, he's still soloable on open ground on dead servers by doing the wide circle dance, 90+% of the bridge griefers are out of business or have their task significantly complicated (forming and getting a legitimate raid group onto the bridge), and the black storm dragon can still make his airborne appearance.