Just want to say how much toxicity is in a discussion such as this. It's very telling indeed of the types of people Blizz is catering to with such a decision. Can't believe something as simple as this has to be made into such a song and dance about the logistics of it.
If you paid for the privilege and earned the mounts to be able to do so, then you should be able to have that right. PERIOD! If I do a meta achievement that takes me at least a year in which the reward is a Violet Proto Drake like the "What A Long, Strange Trip It's Been" achievement requires and gives you, then they sure as hell better give me that right. I spent a full year if not more trying to get it, and fuck it all, I think I've earned that right to not only get it, but to farm the gold necessary to buy the necessary flight licenses to give me that option. Now you tell me that it might be all for naught in the new continent, and you're open to the idea of taking something completely away after I worked so hard to get the mounts and the gold to be able to use them? To put it simply, fuck that shit!
Call it for what it is: pandering to a certain niche part of the WoW demographic who need to be careful about what they wish for.