Edit, because things definitely get lost in the sea:
I do think a compromise between flavour and function could work as well. Something like limiting the ability of non-Evoker Dracthyr to Glide inside instanced content would erase most all objections.
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Original Post:
I have concerns. Glide negates knock back/up mechanics in PvE, and the idea of their being a race that can negate these mechanics is… worrisome.
Picture a fight like Ner’zul. A badly placed cleanse will kill anyone who can’t mitigate the knockback - with Dracthyr existing, suddenly racial choice can compensate for mechanical failure, and it never should to that degree. Dathea is also a good, recent example of a fight that would be impacted by the ability of a good chunk of classes being able to suddenly negate knockback with no cooldown.
Additionally, Glide can be spammed while running to move at a good clip faster than base movement speed - I’m not sure what speed exactly, but I have seen Evokers outpace Feral Druids with Glide tech.
Both of those things are totally acceptable, on a class-to-class basis (DH and Evoker), but a race with these advantages? It would be extremely difficult to argue that players would not race change for these things. Glide should absolutely not be kept as a racial and should be moved to Evoker only.
I completely understand and sympathise with the feeling that “I have wings, I have to be able to glide”, but from a racial balance perspective, I just can’t see how this can be kept as-is.
I haven’t considered the PvP side of this at all either, as it is not something I do, but I would not be surprised if there were issues on that end as well.
I really do hope this is addressed, but even if it is not, I wanted to at least express these concerns in the proper forum.