That's my whole point. With the developers also promoting the idea that Heavensward is outdated and not worth doing, people won't have much reason to go ahead and do it later on. And even if people don't care about the story in XIV, the 3.X maps, dungeons, quests are amazing. That's months if not years of development work put into 3.X content which is still great but it will just be skipped by those that buy the level up potion. That's 1-2 months of play time that people will skip which is still good to do even when it's outdated.