It seems odd to me to cast this as a punitive action.Why stop there? Delete their account if they don't log in for a year. That'll teach them.
The idea I've presented directly addresses the concerns expressed in this thread.
Some of these games go on for decades and I don't see why someone who quit playing 10 years ago should care about his name on a ball of ice in a universe he has long since forgotten about. I've played, and subsequently quit, dozens of games over the years and about 10 minutes after I leave I don't care if the title shuts down - much less whether or not my name remains on an asset. A year, two years - whatever, that is plenty of time to decide to return to the game and reset the timer.
People who leave the game aren't going to care.
People who stay with the game will care, but aren't threatened by the policy.
People new to the game will care.
^--- Looks like we're checking all the right boxes there.