Did they not know that MSQ are also quests that grant exp along the way? I mean if you'v been doing them as they come up, you'll either get to the level required to unlock ti anyway, or you get to a point where the next MSQ is too high for you (meaning the dungeons up ahead are also too high for you anyway...) I mean if you got rid of MSQ, you're still essentially doing quests or straight up grinding (which is far far more tedious than the former) to level up toward 50.
Can you name some examples of such MMOs doing this? I've only ever played WoW and they never had done this sort of thing. And if you don't believe that they are incorperating changes to trial/dungeon queues to accommodate for ARR (new players get faster queue, and the dungeon will pop without having the required 4/8 man party), then there's nothing else to push the envelope on, we're just butting heads for no reason.