This is a really, really, really dumb suggestion, when you look back on the history of the game and see players used to call for Mateus to be merged into Balmung because Mateus was the emptiest deadest world. Now look at it.
Or when the first new EU worlds launched and players cried out at fragmenting the already thin player base. Fast forward just a few years and suddenly players are crying for new worlds because everything is congested.
Just a little bit of time all too often makes these suggestions look ridiculous in hindsight.