They really have. By only enabling it when it doesn't matter anymore.
7.2 will enable flying, but it will be done after people have spent months on the Broken Isles doing their quests while not flying. After we unlock it, that will probably be it in terms of content, before they release the Argus patch. At that point we won't need to fly on the Broken Isles, because we'll be on Argus, which will probably be not flyable either.
It's just like with WoD, where we were only able to fly once nobody needed to anymore anyway. Because the expansion was over. When the flying patch came out, I had 2 days of gametime left. And I didn't renew my sub at that point and went on a 1-year break, because the expansion was over anyway.
This will be the standard now. Flying is gone.