Why take away flight every expansion only to have it unlockable? You seem to be unaware that this is the way it's always worked.
Molten Front, Tanaan and Timeless Isles did not take away flight. They limited access to new content areas. You will see that the pro-flight conversation has no ill-bearings towards these no-fly-zones. It worked, Blizzard used it multiple times to great effect, and people are happy with it. What Blizzard is doing now is fixing something that isn't broken, and the people affected by this global change have voiced out their concerns. Again, I do not agree with all the pro-flight concerns, but I value the message and intention.Do you really want to go to a model where you have to do every storyline quest, and every other achievement it's locked behind to get it just to have it taken away again when the next patch is released?
Well, many players have never attempted Mythic either. What do you think will happen if Blizzard removes this? Do you agree that the statistics showing that a low percentage of players have done Mythic is reason for its removal? I do not, therefore I do not substantiate stats towards or against flight as good reasoning for its removal.Keep in mind that there are still many players who don't even have the rep requirement done yet almost 2 months in and were only 2-3 months from the next patch. Add on that Blizzard is trying for faster patch cycles to give longevity to content and that means that there will be people who never unlock flight using that model.
As for Blizzard adding quicker patch cycles - I don't see how this matters to flight. In most cases of patch content, Blizzard usually introduces completely new subzones and areas for people to quest in. Molten Front, Thundering Isles, Tanaan, Timeless Isles. What did they have in common? Ah yes, they were no fly zones regardless.
Because that was intended in the design from the start. Which is how I would hope Blizzard to improve upon. Instead, it's met with 'too much effort to design around, lets just ignore and gate it instead'. This benefits Blizzard the most, and I fully understand that stance. What I'm saying is I do not fully agree with said stance, and I think it's on them to compromise on having flight, not the players.As far as Wrath and other xpacs, the problem still persisted. The difference in those xpacs was that flight was still something new (relative term when you consider lifetimes of the game and MMO model), as well as the fact that flight was required for a few parts of those xpacs.
We have to assess what content is being trivialized.That doesn't mean that once you got flight for the 1% of the content it was needed for that it didn't trivialize the other 95% of the game. (Before you attempt the flaws in my math, only about 4% of content is instanced areas without flight).
The majority of end-game content lies in Instanced content. Flight is completely absent from this, thus the '95%' of trivialized content is most relative to the grind - dailies, reputation, professions and the odd case of world PVP/bosses. In essence; content that is trivial to begin with.
TBH, I didn't touch Icecrown at all after hitting max. I capped at Storm Peaks, and I didn't return to Icecrown until the Tourney was placed there. There was literally no reason to be in the zone on foot. Even with flying, there was little reason to be there unless you were a quest completionist. It wasn't until Tournament dailies when the zone became relevant - and that punctuates the point I am about to make - the Dailies were designed for the Zone with flight in mind. Kill quests are still kill quests regardless of how you travel; we all treat it as get in - kill - get out. As for the more interesting quests, they were all done without a flying mount. Ride a hippogryph and toss spears down at pirate Vyrkul; or ride a mount and joust. This is how (I think) Blizzard should be designing their content. There's no reason to limit flying in the world when the content itself can do that!The issue was still there, it just wasn't a sign noticed because people were still going thru the "new, shiny" aspect of flight. It still had the same issues of being a convenience only method of travel while completely trivializing the world and any dangers it has. Imagine an Icecrown zone with no flight if WoW had never had flight, it would be a much different zone and probably one of the most dangerous areas ever made, even with the "safe" roads to travel.