A huge amount of flying areas don't have ground beneath you though. Either you have nothing but empty sky, like in Churning Mists or Sea of Clouds, or you have non-landable terrain, like mountains and bodies of water.
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Yeah, but (hypothetically speaking) if your driver DCs and you're in pillion limbo and floating in the middle of nowhere... you have to have a safety net for that. Either a teleport to the nearest aetheryte (though that could be abused for free teleports however minor that is) or it just leaves you flying in the air on your own mount. Either way that's just one way to handle things.
If you wedding teleport onto someone flying, or die in midair, you are sent to the aetheryte. Just make dismounts/warps send the passenger there.
Also the fact that they said there will be 2 person flying mounts must mean they have plans on how to address said issues :D
Bumped, I 2nd this!!