No because there's a lot available right now to play. To get rid of all of it for the sake of making it feel more new to old players would be a punishment for new players or players not yet at end-game which is most. The game has maybe 2 more expansions before we're completely done (6.0 is the end of Ascians, 7.0 will likely be about the bigger fish in the sea that set the scales in motion). If there's an 8.0 it might be a continuation of said big bad guy. We'll likely see a shift towards the next FF MMORPG in the coming years, they made a lot of money with 14, they know they can make something better with the lessons they've learned. With that said, there's no need to create another calamity just for people who think they completed all the content which is <0.1% of the player-base. They already removed a lot of ARR content for the second time.