Square Enix has just announced that the Mobius Final Fantasy will end service and shut down on March 31 in Japan, and then June 30 for the international version.
After March 31, Magicite will not be sold anymore. And after June 30, any Magicite bought before will not be available to use.
Square Enix also confirms that until the shutdown of the game, there will still be updates and in-game events, and a conclusion to the Warrior of Despair story.
Original news: http://information.mobiusfinalfantasy.com/ne/2020/01/15/945eba16cdb78b88508a40d8b232db0ee77bbd32.html