Someone brought up a while ago that it's almost more advantageous for Dragons that Fairy-type is immune to its attacks, rather than simply resistant. The two most powerful Dragon-type moves, Outrage and Draco Meteor, take full advantage of this. Outrage becomes unlocked when a Fairy switches in, while Draco Meteor doesn't sustain a SpA drop. Both of these loopholes should make it easy for Dragons to switch to their appropriate coverage move and continue their work.
It's gonna affect things still.
Choice Band Outrage was extremely powerful in gen 5, but now it is a terrible idea because of Fairies. To get strong Outrage they'll have to look at a Life Orb, which hurts survivability quite a bit, and with Talonflame running around, that chip damage really opens you to being revenge killed.
Basically, choice sets for Dragons are MUCH less interesting now, because using their best moves at their full power is made difficult by the mere presence of fairies.