A website which tries to accurately track how many people are playing a game shows over 1m people playing God of War over the past month. 500 000 were returning players getting a new trophy, while 600 000 were new players.For instance look at God of War a game that won GOTY. Is God of War better than Gears 5? that is subjective but what isn't are the facts that while almost nobody is playing God of War anymore nor even think about it
That said, it can be difficult to know just how exact those numbers are. A year ago, Sony said the game had sold over 10m copies. The website says that today, 20m players total have launched the game. They do mention that their numbers are higher for every game since they dont track sales, but players. The player count tends to be higher than sales due people sharing a console (one game, two accounts on same console), due to player sharing game with friends, due to people reselling their game, due to people renting games, due to promotion allowing you to play a game without owning it, etc. In God of War's case, I expect that PSnow influenced that number. They base their numbers both on leaked data and by looking at trophies/achievements earned.
More to the point: 1m people playing the game over the last month isnt "nobody playing or thinking about it". Even if we assume their number are 200% (down from 20m played/shared/rentwd to 10m sold by Sony) of what they should be (highly doubtful) it would still be 550 000 players who shouldnt be dismissed. Or about 250 000 returning players and 300 000 new players. The website believes the margin of error to actually be around 10%, so could be higher than 1.15m by 10%, or lower by 10%, which is still around 1m.
I think you may be underestimating the lifespan of strong single player games. When a game is good, people will come back to it.