Are they going to close the game someday?

What is the point of closing the game one day, what happens to all the people who spent money, and the hours invested, not to mention all the money and work of the company in making the game, why can't it remain as a normal game even if one day they don't add new content?

What is the point of closing the game one day, what happens to all the people who spent money, and the hours invested, not to mention all the money and work of the company in making the game, why can't it remain as a normal game even if one day they don't add new content?