Then it should be officially stated that the game is no longer in development (and/or remove real money purchases).
However, leaving things to rot behind a wall of silence is not only going to decrease the playerbase - which will reduce any money the game might still make - but will it will also tarnish a developer’s reputation. Project Aperion / Godfall might be the greatest game ever developed - but as is, I, at least, am going to be careful investing anything (time, money) in it when it is released.